Justin O'Reilly had a modest suite in the magnificent Dietz. It adjoined the luxurious suite of Mr. and Mrs. John Heron, and consisted of a small sitting-room, a bedroom, and bath. He was tying his necktie when the telephone bell rang. He grabbed the receiver as if it were a snake that had to be throttled, and gave it a grudging "Hello!"

"A lady to see you," a voice answered.

"She wasn't told I'm in, I hope? A nice thing for a well-regulated hotel if——"

"No, but she says it's important. She's Miss O'Reilly."

Miss O'Reilly! The man of that name was perplexed. The only Miss O'Reilly who, as far as he knew, could possibly call on him, was the last woman he would have expected to do so. He had come to New York largely in the hope of seeing her. She had refused to see him.

"Tell her I'll be down in three minutes," he replied.

"She particularly doesn't want you to come down. She says she has some private news for you, and asks if you'll see her in your own sitting-room."

"All right," he tried to answer calmly. "Have the lady shown up."

He rushed back into his bedroom to wrestle once more with the tie. He must be ready to receive Miss O'Reilly at the door, and his waistcoat and coat were yet to put on. But it could be managed. The suite was on the fifteenth floor, and a full minute's walk from the lift for an old person like Miss O'Reilly. Bungling everything in his haste, he tried to think what it might mean. It looked as if she must have changed her mind, and be ready to sell him her house, the dear old house on which he had set his heart. Perhaps she would demand a higher price than he had offered. Well, he must pay it somehow. Heron would lend him the money—but no, there were reasons why O'Reilly didn't wish to accept favours from Heron, often as they had been pressed upon him. As he slipped into his coat, he heard the expected rap at his sitting-room door, and hurried to open it. A page-boy, acting as guide, had run ahead of the lady, to knock.

"Miss O'Reilly to see Mr. O'Reilly," he announced, with Irish relish of the Irish name. Then he erased himself. O'Reilly stood on the threshold, waiting for the right lady to appear, and meanwhile dodged back from the wrong one, a small, slim flapper in white, who for some reason had paused before his door. She stood quite still, and stared up at him unwinkingly, as a child stares.

"I beg your pardon," O'Reilly said, wanting to laugh. "May I pass? I must look for a lady who——"

"I'm the lady," the creature in white intervened. "That is, I am if you are Mr. O'Reilly."

"O'Reilly's my name," he admitted. "But I was expecting—or—perhaps my cousin sent you?"

"Perhaps I am your cousin," suggested the girl who (Justin saw, now that he looked her deliberately in the face) had the biggest, blackest eyes, and the whitest skin he had ever seen. She had, also, red hair under a fetching hat. Although the child was no beauty, she had an amusing, elfin air.

"Delighted, I'm sure," he felt obliged to answer. "I thought I had only one cousin in the world, Theresa O'Reilly, of Gramercy Park. But——"

"It sounds like the chorus of a song; 'Theresa O'Reilly, of Gramercy Park,'" Clo was unable to resist remarking, with her strongest brogue. "Will you please ask me in?" she said. "My errand's very pressing."

Mechanically the man stepped aside and let her walk into the room. He began to suspect that he had been "spoofed." He did not invite the young person to be seated, but looked at her expectantly. Her first move was to shut the door. She did not speak.

"May I know your name?" he inquired, as they faced each other.

"The same as yours, but for a letter or two," said Clo, marking time. "That's why I may be a cousin; one never knows. I didn't come to talk about the family tree, though, Mr. O'Reilly. I came to beg—not for money, so don't be frightened."

"I'm not conscious of fear," laughed O'Reilly. He couldn't help laughing. He didn't believe the girl's name was the "same as his." "If I'm not afraid, I am curious," he confessed. "What are you going to beg for, if not money? Is this a message from my cousin——?"

Clo ceased suddenly to be impish. She had got into the enemy's fastness by her impishness, but she could go no further on that line. This man, being the exact opposite of the type expected, upset her plan. A big danger was that she might like this O'Reilly instead of hating him, he was so pleasant and gallant-looking, more a protector than a persecutor of women. She might hesitate to cheat or trick him in whatever way came handy, and thus fail the Angel on top of all her boasts. In her hot little heart Clo prayed for the wisdom of the serpent, and as her elfin face took on anxious lines, she became more interesting to O'Reilly. Her white face looked pinched and desperate. "If I were Marat, and she Charlotte Corday," was the thought that jumped into his head, "she would stab me."

"It's a good thing for me you have a cousin, or maybe you wouldn't have let me in. I know now why God gave me the name of Riley. I guess he'll forgive me for borrowing the 'O.' I was obliged to get to you somehow. That was the one way I could think of."

"It was a pretty smart way," O'Reilly flattered her. "But you haven't told me——"

"I will. Only—I think I'll have to sit down. I feel rather—queer——"

"Good lord! You can't faint here!"

"I won't, unless you make me, I'll promise that!" She had her cue now.

"Sit down, for heaven's sake!" said O'Reilly, pulling up the biggest chair in the room. Clo sank into it. Closing her eyes, she drew in a gasping breath which made her girlish bosom heave.

The man stood by, feeling absurdly helpless.

"Shall I ring for brandy?" he suggested.

"No—please!" She opened her great eyes again. "Only listen. I've come from Mrs. Roger Sands—to beg you for those papers of hers."

"Mrs. Roger Sands! Her papers? I know nothing of any papers belonging to Mrs. Roger Sands," O'Reilly exclaimed. "What papers are you talking about?"

"The ones you hired a man to steal when the train got to Chicago."

O'Reilly started. "Whose accusation is that?" he asked sharply.

"Not hers; it's mine."

"Yours! Once again, who are you? What are you in this?"

"I'm nobody! I'm only—a lion's mouse."

O'Reilly did not ask what it meant to be a lion's mouse. He understood. His mind was not less quick than hers.

"And I'm the net you hope to gnaw! Miss Mouse, your little teeth will find me tough. I may say I'm a patent, ungnawable net. The best thing for you is to go home as fast as you can and tell those who sent you——"

"I sent myself," Clo explained, with tired obstinacy. "I told you I had to see you somehow. Oh, Mr. O'Reilly, you don't look the sort of cruel pig I thought you would be. If you dreamed what Mrs. Sands is going through you'd give her back the papers. Don't pretend not to know what I mean."

"I won't pretend anything," O'Reilly said. "I do know what you mean, and I got the documents (which were not the property of Mrs. Sands) more or less as you think I got them. But no mouse, no mastodon could induce me to hand them over to your friend."

Clo's eyes travelled over his person. He looked slim and soldierly in his well-made evening clothes. There could be nothing thicker than a watch, and that a thin one, in his pockets.

"If you would see Mrs. Sands, maybe you'd change your mind," she pleaded, in her creamiest Irish voice. "Take me back to her, and take the papers along. Then, if you——"

"I can't do either," was O'Reilly's ultimatum. "I'll take you downstairs and put you in your car if you've got one, or a taxi if you haven't. But——"

"You'll have to take me home," said Clo. "I won't try to start without you. I've gone through enough. I'll just let myself collapse. I promised not to faint unless you made me. Now you are making me."

"You deserve to be thrown out of the window!"

"I have been, once," the pale girl announced. "It was four storeys up, and all my ribs were smashed. This is my first day out of bed. I thought I could manage it, if you were kind. I'd gladly die for Mrs. Sands. And if I do——"

"Brace up!" O'Reilly cried. "I'll take you home. I know where the house is. I passed it this afternoon. There was a man who——But no matter. Have you got a car below?"

Clo was almost past answering; almost, not quite. But weakness was her "cue," as well as the line of least resistance. Having now an incentive to let herself go rather than "brace up" as O'Reilly urged, she enjoyed collapsing. Yet something within was on guard, and knew that O'Reilly had to be watched.

He dashed to the telephone and ordered a taxi. Then he returned to the girl in the chair. Her eyes were half shut, a rim of white showing between the lashes. The man could not help believing the queer story she had gasped out, about the fall, and the broken ribs, and this being the first day she had left her bed. That would account for her thinness and paleness. He touched her hand, which hung over the arm of the chair. There was no glove on it, and the pathetically small thing was icy cold.

"She's fainted, fast enough," he growled. Clo heard the words dimly, as though she had cotton wool in her ears. Her duty was to trick the man, but she didn't like doing that duty.

O'Reilly gently laid down the tiny paw he had taken in his. It was limp as the hand of a dead girl. Clo would have felt less compunction if he had dropped it roughly. He took a few brisk steps, as though he had come to some decision. She forced herself back from the brink of unconsciousness to realize that he was going toward the door—not the outer door, through which she had entered, but another. He opened this, and Clo saw that beyond was a bedroom. Quickly he went to a table where stood a tall glass jug filled with crushed ice and water. His back was turned to the girl as he began pouring the jug's contents into a tumbler, but suddenly, as if on a strong impulse, he turned. Clo did not even quiver. Something told her that the thing she had prayed for was about to happen.