As I left the Exposition grounds and came out upon Stony Island Avenue I looked at my watch, for I had in mind much that I wished to accomplish before night came on. It was nearing three o'clock, and I hastened my steps.

Glancing about as I put away my watch, in the hope that I might see Billy or Dave, as they from time to time shifted their place of observation, I saw, to my annoyance, on the opposite side, but coming toward me almost directly across the street, Mrs. Camp. Her eyes were fixed upon me, and when she had reached the middle of the highway she waved her arm in frantic gesture, which, in spite of my haste, brought me to an instant standstill, knowing as I did that she was quite capable of shouting out my name should her signal be ignored.

As she came nearer I saw that her eyes were staring wildly, and her face wore a look so strange and excited that for a moment I feared that the marvels of Chicago and the Fair had unsettled her reason, and her first words did not altogether reassure me.

'If this ain't a mercyful dispensayshun,' she panted, stopping squarely before me, 'then I don't know what is! I was goin' to hunt ye up jest as fast as feet c'd travel, an' I never spected to be so thankful for knowin' a perlece officer ez I be ter-day. My!' catching her breath and hurrying on; 'if I couldn't 'a' seen to gittin' them wretches arristed afore night, I'd 'a' had a nightmare sure, an' never slep' a wink!'

'Mrs. Camp,' I broke in, 'not so loud, please.'

'Ugh!' The woman suddenly dropped her loud tone and looked nervously around. She was trembling with excitement, and the colour came and went in her tanned cheeks.

And now, to my surprise, I noted dangling from her arm beneath the loose wrap, which she wore very much askew, a black something, which, as she lifted her arm to pass her hand across her twitching lips, I perceived was an ear-trumpet attached to a long black tube such as is used by the deaf, and my fears for her sanity were increased.

'Mrs. Camp,' I said, in a soothing tone, 'you seem exhausted; let me take you to your rooms, if they are not too far, and you can talk after resting.'

Something in my tone or look must have enlightened her as to my thoughts, for she suddenly broke into a short, nervous laugh.

'Oh, I ain't crazy! Though I don't blame ye if ye thought so,' she said, with an attempt at composure. 'I was comin' to see ye, and it's important. I was goin' to that Miss Jenrys, but I forgot the number her aunt give me, and so I struck right out for that office where Adam and me met ye that first time when I wanted ye arristed right off, ye know. But, land! I be actin' like a plum fool. Come right along!' She caught my arm and turned me about. 'My place ain't fur, and I s'pose we can't talk in the streets.'

I began to fear that I should not easily escape her, and moved on beside her, her hand still gripped upon my arm as if for support.

'I shan't open my head ag'in,' she said as we went, 'till we git there.' And she did not, but when we had reached her door and I was about to make an excuse, and after seeing her safe indoors hasten on in my search for Dave, she said, much more like her usual self:

'Come right in now and find out what kind of a detective I'd make if I had a chance. It's your business, too, I guess;' and then, as I seemed to hesitate, 'an' it's about that counterfittin' man.'

Suddenly, somehow, the notion of her insanity vanished from my mind, and I followed her into the house.

She opened a door near the entrance, and, after peeping in, threw it wide.

'It's the parlour of the hull fambily,' she explained as I entered, 'and I'm thankful it ain't ockerpied jest now, for our room ain't more'n half as big.'

It was the tiniest of parlours, but not ill-furnished, and the moment she had dragged forward a chair for me, after the manner of the country hostess, and had made sure that the door was close shut, she drew a small 'rocker' close to my own seat and began eagerly:

'I've had an adventer to-day, a reg'lar story-book sort of one. It's made me pretty nervous and excited like, and I hope you'll excuse that; but I'm going to tell it to you the quickest way, for, 'nless I'm awful mistook, them folks'll git out quick's they find out who I be, or who I ain't, one or t'other.'

'My time——' I began, hoping to hasten her story, but she went on hurriedly:

'Ye see, Camp has got so sot and took up with them machines, and windmills, and dead folks, and dry bones down to'rds that south pond that he ain't no company for nobody no more; so this afternoon—we didn't neither one go out this mornin', for we'd been to see Buffaler Bill las' night, and we was tuckered all out—so this afternoon I went with Camp down street instead of goin' the t'other way, for he thought 'twould be a good idee to go in a new gate; but somehow when we got there I didn't feel much like goin' in, seemed like 'twould be sich a long tramp, and I jest left him at the gate and sa'ntered back, thinkin' I'd rest like an' be fresh for a good long day to-morrer.'

'Yes,' I said, as she seemed waiting for my comment, 'I see.'

'Wal, I come along slow, and right down by—wall, I'll show you the place, I'm awful bad 'bout rememberin' names; but when I'd got more'n half-way home, an' was 'most up to a house that stood close to the street, I see the door begin to open, real careful at first, an' then quick; an' then out of the house came a tall man. He didn't look back, but I c'd see there was some one behind him, an' then the door shet. The man come down the steps, an' then he seemed to see me, an' a'most stopped. I tell ye I was glad then that I had on these.'

She thrust her hand into her pocket and drew out a pair of those smoked-glass spectacles so much affected by sight-seers at the Fair, and I was forced to smile at the strange metamorphosis of her face when she put them on and turned it toward me. With the small, sharp eyes, her most characteristic feature, concealed, the face became almost a nonentity.

'Would you 'a' knowed me?' she demanded.

'I think not.'

'Wal, I guess he didn't; anyhow, he give me a sort of inquirin' look an' started off ahead of me. An' who d'ye s'pose he was?'

I shook my head, anxious only that she should get on with the story.

'Wal, as sure as my name's Hanner Camp, 'twas that feller 't changed the money fer Camp; the furriner one that I see in that Cayrow house; the one with the hands!'

'But—you said——'

'Yes, I know I did; but I studied it all over, an' I wa'n't mistook, not a mite! That feller jest went through an' out the back door, and changed his clo's somewhar, an' came back playin' gentleman. But, I tell ye, I knowed them hands! 'Twas him I seen come out of that door to-day.'

'Are you sure?'

'Sartin sure!'

'Then—wait one moment. Did you see him go far? Where did you see him last?'

'Wal, there—there was an alley next to the house, and acrost that was another house, and then a saloon. He went into the saloon.'

'Oh!' This was the answer I had hoped for. 'Pray go on, Mrs. Camp.'

'I'm goin' to. You know I said there was a man come and shet the door; wal, I got jest a glimpse of him at the door, and it kind o' started me, and I came by real slow, a-lookin' at the house. I noticed that every winder in the front was shet, and the curtains down, all but one, and that was the front one next the alley; that was open half-way and the curtain was up. I couldn't see inside, but jest as I came oppersite the winder a man's face popped right out of it for jest a minit, lookin' the way the other feller went, and then it popped out o' sight ag'in; but I had seen it square!'

'Who was it?' I demanded, now thoroughly aroused.

'It was that feller that was so perlite to Camp and me the time you was arristed; the Sunday-school feller.'

I started to my feet, and sat down again. She had been doing detective work indeed! I thought I could understand it all. This was the house we had for days suspected and watched, but the only one ever seen to enter it had been Greenback Bob. Doubtless the murder of the brunette made them so uneasy that, contrary to custom, Delbras had ventured out by day, probably to learn what he could of the movements of the officers. I turned to Mrs. Camp.

'Mrs. Camp,' I began earnestly, 'I am going to confide in you. Those men belong to a gang of robbers and murderers; we have been watching them for weeks. Fortunately, you have come upon them in such a way as to locate their hiding-place; you can help us very much if you will try to recall everything just as you saw it there, and will answer a few questions, when you have told your story. Or—is this all?'

'All! I guess it ain't all; an' I guess you won't need to ask many questions when I get through!' I nodded, and she went on rapidly:

'When I see that feller dodge back and shet the winder, I remembered what you had said about him and the others, and 'bout their tellin' me, to that office, how you was a detective yourself; and I jest sez to myself, says I, "I'm goin' to try an' git another look at that house;" so I went on past it till I come to a little store, and I went in an' bought ten cents' worth of green tea, and when I comes out I goes back, jest as if I was going home with my shoppin'. By the way, you ain't seemed to notice these new clo's.'

I had noted the black gown and cape-like mantle she wore, both plain, but neat and not an ill fit; and I had also wondered how she had happened to discard her old straw hat with the lopping green bows for the simple dark bonnet she wore, but she did not wait for my criticism.

'I'll tell you how't come,' she went on. 'I ain't blind, and I'd been a-noticin' the difference 'twixt my clo's and some of the rest of 'em; and I was specially took with them plain gownds them ladies wore that you interduced me to that day; an' I jest studied on it, and sort o' calkalated the expense, and then went up to the stores. I wanted a gray rig, like that Miss Ross had on, but I couldn't get none to fit, an' the young lady told me 't black was dredful fash'nable now, so I got this rig; an' 'twas lucky I did ter-day.'

What could she mean by this diversion? I was growing uneasy when she uttered the last words. 'Yes?' I said feebly.

'I s'pose you wonder what I'm drivin' at?' she queried. 'Well, it's comin'. Ye see, I was wearin' these clo's, and the goggles, as I call 'em, when I went sa'nterin' past that house; but I hadn't got to it, nor even to the s'loon yet, when a cab—one of them two-wheeled things, you know, with the man settin' up behind to drive.'

I nodded.

'Wal, it drove up, an' the man opened the door, right in front of that house, an' out got a woman; she was bigger than me, and all drest in black, an' she looked sort of familiar, an' jest as I was wonderin' who she made me think of, an' she was a-paying the driver, up comes another cab, tearin', and out hopped two fat, red-faced perlecemen, an' there was a little squabble like, an' the woman flung herself round so't I could see her face, an' then I knew her.'

She paused as if for comment, but I was now too much amazed for words.

'I knew her in a minit,' she resumed, 'an' it was that woman that come stridin' into that rug place in Cayrow Street that day. She hadn't no long swingin' veil on this time, and she didn't look nigh so big 'longside them big perlecemen. She had give up quiet enough when she seen she had to; an' they put her into the cab an' drove away, with t'other one behind 'em. I walked pretty slow, so as not to come right into the rumpus, an' I thought, as I come acrost the alley, that I see somethin' a-layin' by the side-walk on the outside. I looked round, and seein' that every last winder was as dark as black, I stooped down to look at the things, an' here they air.' And she shook out with one hand a long black veil which she had drawn from her pocket, and held out with the other the snake-like speaking-tube.

'I c'n see you're in a hurry,' she said, dropping the veil and tube into her lap, 'an' I'll git to the pint now, right off. I wa'n't never no coward, and I jest ached to find out what them fellows was up to. Mebbe if I'd stopped to think I wouldn't have run the risk, but while I stood there with them things in my hand a idee popped into my mind. I looked round; there wasn't a soul near me, an' the winders was all dark, so't nobody could see me from the house, and of course they hadn't seen the woman git arristed an' took away. We didn't look much alike, but I thought mebbe they'd let me in, thinkin' 'twas her; and when I got in I'd tell 'em I'd found the trumpet at their door, and p'r'aps, if I felt like it, I'd say I'd seen a gentleman to the winder that I was 'quainted with; that is if he didn't come to the door. Anyhow, I thought I'd try to make sure it 'twas him I see at the winder.'

I shuddered at her cool recital of such a daring venture; and yet I could see how, with her country training, she would see nothing so very serious or dangerous in thus thrusting herself into a strange house, gossip-like, 'to find out what was goin' on.' She took up the trumpet.

'I was used to these things,' she said, 'for my aunt on my mother's side used to live with me; she was a old maid an' she used one. Stone-deef she was, a'most, but I didn't think then o' usin' this. When I got onto the top step I felt 'most like runnin' off all of a sudden, but I set my teeth and give the bell a jerk. 'Twa'n't long before the door opened jest a crack, and I see an eye lookin' out. I meant to git inside before I said anything, so I kind o' give the speakin' trumpet, hangin' over my arm, a shake; it was 'most hid under the veil, you know; and then the door opened wider, and I see a woman. My! the palest, woe-begon'dest woman I'd ever see, 'most. "Oh!" she says, in a shaky, scairt sort o' voice, "come in quick." She looked so peaked and strange I jest stood starin' at her a minit, and all to once she reached out her hand and motioned to me; and as I stepped in she caught hold of the big end of the speakin' trumpet, and then I see that she thought I was deef; and quick as a wink it come to me to play deef 's long as I could—deef folks are allus makin' blunders—and then to 'polergize an' git out. So I stuck the tube to my ear.

'"You're the nurse?" she says through it, but not very loud, for a deef person, that is. "Louder," sez I. So she sed it real loud, an' I nodded.

'Then she motioned me to come into the room to the front, that I had seen the man look out of. It was 'most dark there, only there was a winder on the alley that 'peared to be all boarded up, only jest a slit to the top to let a little streak of light in. "Set down a minit," she says; an' when she let go of the trumpet her hand shook so't I could see it. She opened the door in the back of the room, an' I see there was a screen on the other side so I couldn't see the room, but I got up an' tiptoed to the door. The carpet was awful thick there an' in the hall, though it was old enough too.

'She hadn't shet the door tight, an' I heard her say, "Wake up, Bob." An' then a sort of question; an' she says ag'in, "The nurse has come after all, and you can go and sleep now." Then I heard a man say, "What made the old gal so late, blast her eyes! I'd go an' give her a good old blessin' if she wasn't sech a crank-mouthed jade." An' then he seemed to be stirrin', an' I 'most thought he was comin' in; but then he says, "Git her in here, an' then git me somethin' ter eat. I can't sleep when I'm so holler." "Won't you come in an' speak to her, Bob?" says the woman, "an' tell her 'bout the med'cin'; I'm so tired."

'Then I was scairt ag'in, though I declare I felt sorry fer that poor crittur of a woman.

'But the man snarled at her, and says, "Naw, I won't; I'm tired's you be. Hustle now, an' bring me the grub mighty quick."

'I scooted back to my chair then, and in a minit or so she come in an' motioned me to come into the other room. I see they had mistook me for some deef nurse, an' I begun to think I'd grabbed more'n I could hold, an' to wish I was out. But I went in, an' if ever a woman was struck all of a heap, 'twas me.'

She paused as if mentally reviewing the scene once more, and I fairly quivered with anticipation and anxiety for what the next words might develop.

'I had noticed that there was three winders on the alley side of the house,' she resumed, 'an' there bein' only one in the front room, of course I looked to see one sure in this, an' mebbe two, but there wasn't a winder; the wall on that side was smooth, only at the winder place was a kind of cubbard arrangement like, an' the room was lit by a kerosene lamp. It was furnished quite good, too; but in a corner on the bed laid a young man, as good-lookin' about as they make 'em; only he was dretful pale an' thin, an' he 'peared to be sleepin'.

'"There's yer patient," says the woman, through the tube. "There ain't nothin' to do now only ter give him drink, an' not let him talk if he wakes. He sleeps a good deal, an' when he wakes up he's out of his head, an' 'magines he's somebody else, an' ain't in his own house, an' all sorts of nonsense." She went to the bed an' stood lookin' at the sick man in a queer sort of way, an' she give a big long breath, as if she felt awful bad, an' then went out by a door that I knew went to the hall, an' I heard noises in a minit more, as if they come from the kitchin stove.

'Now I knowed she took me for a nurse and all that, but all the same I begun to think I'd better git out. I couldn't play nurse an' ask about that Sunday-school feller too, an' I thought I'd jest made a big blunder, an' I'd better git out 'thout waitin' for her to come back; an' jest then I heard a little noise, an' I looked round, an' the sick man had rolled over an' was lookin' at me straight, an' when he ketched my eye, he says, "Come here, madam, please." 'Twas a real pleasant voice, though weak, an' I went right up to the bed. He looked at me real sharp, an' sort of wishful, and then he says, "You look like a good woman."

'I didn't say nothin', an' he kep' right on, sort of hurried like. "I was not asleep when you entered," he says, "and I heard that poor woman. I am not insane, and this is not my home. You have come here to nurse me, but if you want money you can earn a hundred nurses' fees by going to a telegraph office and telegraphin' to——"

'Jest then there was a noise in the hall, an' he stopped, an' I picked up a fan an' stood as if I was a-fannin' away a couple of little moths that the lamp had drawed.

'Nobody came in, so I went to the door an' listened. Seemed as if I heard a door shet upstairs, an' I guessed the woman was taking up the cross man's dinner. So I went back to the bed. He laid still for a bit, and seemed listenin'; then he says:

'"I am a prisoner, and have been half-killed first, an' then drugged to keep me so. My people are wealthy. They will pay you royally if you'll help me; if you'll go to the nearest police-station an' give 'em a paper I will give yer, with my father's name, an'——" He stopped ag'in, an' shet his eyes quick as lightnin'; an' the next minit the pale woman came in quick, an' lookin' awful anxious. She went to the bed an' looked at the sick young feller, an' then she took hold of the trumpet and motioned me to listen. "Can you hear?" she says into it, not very loud. I nodded, an' looked to'rds the bed. "He sleeps real sound," she says, "and won't be likely to wake up, anyhow; I can't leave him alone to talk to you in another room. There's somethin' I forgot, an' some of them may come in any time now. Will you do a wretched woman a small kindness?" She looked at me awful wishful when she said that, an' I nodded my head ag'in.

'"They told me not to let you in unless you gave me a card, and I—I am so troubled I forgot to ask you for it at the door. Will you give me the card now, an' please not give me away to the boys? I can't stand no more trouble. I—I think it was your being so late made me forget. Why was it?"

'For a minit I was stumped, an' then an idee come to me. "Ter tell the truth," I says, as bold as you please, "I've been in a little trouble, an' I forgot that card. You see, I had to put off comin' here on account of a couple of perlecemen that was on the look-out fer me. I've only jest give 'em the slip." You see I thought when she heard that she'd make 'lowance fer the card, an' I wanted to talk more with that sick boy, fer I b'leeved he was tellin' the truth. But, my! she jumps up, lookin' scairt to pieces, an' she says:

'"The perlece! Do you think they will follow you? can they? Merciful goodness! we can't risk it. I'm almost broke down, but I'll call up Bob, an' you must go right away. Don't you see it won't do?" She snatched a key out of her pocket. "Come," she says. "Mercy, what a risk!" I had took off my glasses and laid 'em down on the table by the bed. I picked up the black veil I had dropped on the chair, and jest as she went to take the key out of the hall-door—she had to turn her back to do it—I went to the table and took up my glasses, and tried to ketch that poor boy's eye and make him a sign; but, my! he laid there with his eyes shet, an' sech a look of misery upon his poor face, an' all at once it struck me that I hadn't spoke once, an' that he hadn't noticed the trumpet till the woman come in, and then he thought he'd been a-beggin' help of a deef woman. But I hadn't no chance then, an' as soon as she'd picked out the key, she says, "I'll have to let yer out front. It won't do to risk your being seen coming out by any other way."

'The way was clear when I got out; but I most dreaded meeting one of them men som'ers, and I jest started straight to find you.'

'One moment,' I said hurriedly, as she now ceased. 'You spoke of Miss Jenrys—why did you think of going to her?'

'Why, she was nearest of anybody, an' I thought you was as likely as not to be there.'