Before Mr. Narkom could ask any questions, the sound of excited voices and hasty footsteps coming up the drive and making toward the lonely house drove all other thoughts from his head.

"Come along," he whispered to Cleek. "It's Hammond and Petrie returning from the keeper's shelter on the Common. I know their voices. And they have unearthed something startling or they wouldn't be talking so excitedly."

They had, indeed, as he learned when he hurried out and intercepted them at the cottage steps; for between them they were supporting a man stripped of coat, waistcoat, and hat, and wearing bound round his head a bloodstained handkerchief. His bearded face was bruised and battered, his shirt and trousers were covered with mud, and he was so weak from loss of blood that it was next to impossible for him to stand alone.

"Sir," broke out Hammond, as they came up with Mr. Narkom and paused with this unexpected newcomer before him, "I don't know whether that French mounseer is a wizard or not, but he copped the lay at the first guess, Mr. Narkom, and foreigner or not I take off my blessed hat to him. Here's what we found when we got to the shelter, sir—this here party, knocked senseless, tied up like a trussed fowl, and tucked out of sight under the gorse bushes nigh the shelter. Coat, cap, badge, and truncheon all gone, sir—nicked by that dare-devil who took us in so nicely down there at the old railway arch. The murderer himself he were, I'll lay my life; for look here, sir, here's what he most brained this poor chap with—a hammer, sir—look! And a hammer was used, wasn't it, to spike that dead man to the wall? Had him, Mr. Narkom, had the rascal in our very hands, that's what we did, sir, and then like a parcel of chuckleheads we went and let him go."

"It is a trick that has succeeded with others besides yourselves," said Cleek, who had been bending over the injured man. He looked up at Narkom significantly. "Monsieur, I expect my assistant here any minute now. Would it not be as well to report this shocking affair to the local authorities?"

"Certainly, monsieur!" agreed Narkom, who had forgotten that Dollops might arrive now at any moment.

"What about this poor chap here, sir?" interposed Petrie. "He's in a desperately bad way. Oughtn't we to take him with us, and turn him over to the hospital folk?"

"Non—that is, not yet, my friend," softly interposed Cleek. "Your good superintendent and I will look after him for a little time. There is a question or two to ask. He will bear the strain of talking now better than he might be able to do later. Notify the hospital officials as you pass through the town proper, and have an ambulance sent out. That's all. You may go."

"Well, so help me," began the indignant Petrie, then discreetly shut up and went. A moment later the limousine had whizzed away into the mist and darkness with the three men, and Cleek and Narkom were alone with the injured keeper.

"I expect that is Dollops in his taxi," whispered Cleek. "I thought I heard the sound of a motor. That will obliterate every track if you don't stop him. Head him off if you can, dear chap, and set him to work directly you have dismissed the taxi. Tell Dollops to measure and make a drawing of every footmark in and about the place. Quickly, please, before it is too late."

Mr. Narkom hurried off and vanished in the mist, leaving his ally alone with the dying man, for that he was dying there could be no question.

A bullet had gone through his body; a hammer had battered in the back of his head; he was but partly conscious—with frequent lapses into complete insensibility—and the marvel was not that he occasionally uttered some wandering, half-coherent sentences, but that he was able to speak at all.

"My poor chap," Cleek said feelingly, as he administered a stimulant by which the keeper's flagging energies were whipped up. "Try to speak—try to answer a question or two—try—for a woman's sake."

"A woman's?" he mumbled feebly. "Aye, my poor wife— Gawd 'elp her—her and the kiddies! And me a-goin' 'ome, sir—me a-gettin' of my death like this for jist a-doin' of my duty—doin' of it honest and true, sir, for king and country!"

"And both letting you face the nightly peril of it unarmed!" said Cleek bitterly; then, passionately: "Will you wake up, England? Will you wake up and do justice by these men who give their lives that you may sleep in peace, and who, with a badge and a truncheon and two willing hands, must fight your criminal classes and keep law and order for you?"

"Aye—some day, may like—some day, sir," mumbled the dwindling voice; then it trailed off and sank sobbingly away, and Cleek had to administer more brandy to bolster up his fading strength.

"A word," he said eagerly, the hammering of his heart getting into his voice and making it unsteady. "Just one word, but much depends upon it. Tell me—now—before anybody comes: Who did it? Man or woman?"

"I dunno, sir— I didn't see. The mist was thick. Whoever it was, come at me from behind. But there was two—there must have been two—one as I heard a-runnin' toward me when I challenged, sir, and—and got shot down like a dog; and 'tother as come at me in the back when I sang out 'Murder' and blew my whistle for help. But men or women, whichever it may a-been, I never see, sir, never. But one woman was on the Common to-night. A lady, sir—oh, yes, a lady indeed."

"A lady? Speak to me—quickly—my friend is returning. What did that lady wear? Was it a pink dress? Or couldn't you see?"

"Oh, yes, I could see—she came near me—she spoke in passing. She gave me a bit of money, sir, and asked me not to mention about her bein' out there to-night and me havin' met her. But it wasn't a pink dress, sir; it was green—all shiny pale green satin with sparklin' things on the bosom and smellin' like a field o' voylits on a mornin' in May!"

The sense of unspeakable thankfulness that Cleek experienced upon hearing that the dress of this unknown "lady" was not pink, was lost in a twinkling in one of utter and overwhelming surprise at learning that it was green! Pink, white, and green, here were three evening dresses called into the snare of this night's mystery; and yet a third woman now involved. White satin, that had been Lady Katharine Fordham's gown to-night; pink chiffon, that had been Ailsa Lorne's. Who then was the wearer of the pale green satin gown? Here was the riddle of the night taking yet another perplexing turn.

A clatter of hasty footsteps came along the drive and up the steps to the veranda, and Narkom, in a state of violent excitement, stood beside him.

"All right," he said, answering Cleek's inquiring glance. "I headed the taxi off and set Dollops to work as you suggested—and a blessed good thing I did, too, otherwise we might have lost valuable clues."

"There were footsteps then?"

"Footsteps? Great Scott, yes, heaps of them: the absolute continuation of those which led me and my men to this house. But the madness of the thing, the puzzle of the thing! No man on earth can run away in two directions, yet there the blessed things are, going down the road at full tilt and coming back up it again still on a dead run. Two lines of them, old chap, one going and the other returning and both passing by the gate of this house. By it, do you hear?—by it, and never once turning in; yet in the garden we have found marks that correspond with them to the fraction of a hair, and we know positively that the fellow did come in here. It licks me, Cleek—it positively licks me. It's beyond all reason."

"Yes," admitted Cleek, thinking of the green satin dress. "It is, Mr. Narkom, it certainly is."

"Dollops will bring the drawings he's making to you as soon as he has covered all the ground," resumed the superintendent almost immediately. "Clever young dog that and no mistake. But to return to our muttons, old chap. Did you get anything out of this poor fellow? Any clue to the party who assaulted him?"

"None. He doesn't know. For one thing, the mist prevented him seeing his assailant, and for another, he was first shot down by some one who was running toward him and answered his challenge with a bullet, and then pounced upon by somebody else who was behind him and floored him with the hammer. I take it that the person who was running and who fired the shot was advancing toward him from this direction—was, in fact, the actual assassin—and that having discharged the pistol and caused this poor fellow to whistle a call for assistance to the constable in Mulberry Lane, he was put to it to get out of the box in which he found himself by those two things. To escape across the Common meant to be pursued by the constable and driven across the track of one of the other keepers; so he took the bold hazard of putting on this poor chap's coat, cap, and badge and playing at joining in the hue and cry in the manner he did. Is that"—turning to the dying man—"the truth of it?"

The keeper could only nod—he was now too far gone to make any verbal response, and even the administering of another dose of brandy failed to whip up his expiring strength.

"I'm afraid we shall never get any more out of him, poor fellow," said Cleek feelingly. "He is lapsing into unconsciousness, you see. Raise him a bit, make him a little more comfortable if pos—— Quick! Catch his head, Mr. Narkom! Don't let it strike the boards. Gone!—a good true servant of the public gone! And the blackguard that killed him still at large!"

Then he gently folded the useless hands and closed down the sightless eyes, and shaking out the coat which Petrie had bundled into a pillow, spread it over the dead man and was very, very still for a little time.

"There's a widow—and some little nippers, Mr. Narkom," he said when he at length rose to his feet. "Find them out for me, will you? And if you can see your way to offer a good substantial reward for the clearing up of this case and the capture of the criminal, I'll pull it off and you may pay that reward to the mother of this man's children."

"Cleek, my dear fellow! How ridiculously quixotic. What on earth can you be thinking about?"

"A woman, Mr. Narkom—just a woman—and a few little nippers ... who might take the wrong road as—well, as somebody I know of took it once—if there wasn't a hand to help them or a friend to guide. That's all, dear friend, that's all!"

Lifting his hat to that silent, covered figure, he turned and walked away. But at the foot of the steps leading down to the mist and darkness of the drive he came to a halt; and there Narkom, following almost instantly, joined him again.

"My dear fellow, of all the impulsive, of all the amazing men," he began; but got no further, for Cleek's upthrown hand checked him.

"We won't go into that, Mr. Narkom," he said. "We'll stick to the case, please. I've got something to tell you that you haven't heard as yet. Something that that poor dead chap did manage to tell me. A woman—a lady—was out there on the Common to-night and paid him not to disclose the fact."

"Great Scott! My dear fellow, you don't surely mean to hint that by any possibility that poor child, Lady Katharine Fordham——"

"No, I do not. The lady in question was neither Lady Katharine Fordham, who, you tell me, wore a white satin dress to-night, nor yet Miss Ailsa Lorne, whose frock you say was of gauzy pink. The lady in question wore, I understand, a gown of very pale green satin with what I take to have been several diamond ornaments upon the corsage; furthermore, a delicate but very distinct odour of violets clung about her."

"Good Lord!"

"No wonder you are surprised, Mr. Narkom. Ladies dressed in that fashion are not, as a general thing, given to wandering about Wimbledon Common either by night or by day, and the presence of this particular one is curious, to say the least of it. I am of the opinion, however, that she was no stranger to the Common keeper, otherwise he would have hurried her into the shelter the instant she offered to bribe him, whistled up the constable in Mulberry Lane, and given her in charge as a suspicious character. Then there is another side to the affair which we must not overlook. An entertainment was in progress at Clavering Close to-night, and there must have been quite a number of ladies present dressed in gala attire. But if your exclamation means that you have no recollection of seeing one who wore a gown of pale green satin——"

"It doesn't!" rapped in Narkom excitedly. "It was the absurdity, the madness, the—the utter impossibility of the thing. That she—she of all women——! What rot!"

"Oho!" said Cleek, with a strong, rising inflection. "Then there was such a gown in the rooms at Clavering Close to-night, eh? And you do remember the lady that wore it?"

"Remember her? There's nobody I should be likely to remember better. It was Lady Clavering herself!"

"Whew-w! The hostess?"

"Yes. Sir Philip's wife—young Geoff's stepmother; one of the sweetest, gentlest, most womanly women that ever lived. And to suggest that she ... either the fellow must have deliberately lied or his statement was the delusion of a dying man. It couldn't have happened—it simply couldn't, Cleek. Why, man, her ladyship was there—at the Close—when I left. It was she who put that jewel into my hand and asked me to leave it at Wuthering Grange when——"

He stopped, biting his words off short and laying a nervous grip on Cleek's arm; and Cleek, facing about abruptly, leaned forward into the mist and darkness, listening.

For of a sudden, a babble of angry voices, mingled with the sounds of a scuffle, had risen from the road beyond the gates, and hard on the heels of it there now rang forth sharply the shrill tones of Dollops crying out at the top of his voice:

"None o' yer larks, now! Got yer! Gov'ner! Mr. Narkom! This way! Come quick, will yer? I've copped the bounder. Out here in the bushes under this blessed wall!"