I cursed under my breath. If it hadn't been for the girl, I am ashamed to confess, I should have cursed out loud. She sat rigid and motionless. It must have been a cruel ordeal for her. But what was puzzling me was the fact that she made not the slightest effort to spring her alibi. If _I_ had had one! Where was Hamilton? I scarcely inclined to the idea of sleeping in jail in a dress-suit. Haggerty departed. A silence settled gloomily down on us. Quarter of an hour passed. The grim-visaged police watched us vigilantly. Half an hour, three-quarters, an hour. Far away we heard the whistle of an out-going train. Would I had been on it! From time to time we heard faint music. At length there was a noise outside the door, and a moment later Hamilton and two others came in. When he saw me, he stopped, his eyes bulging and his mouth agape. "Dicky Comstalk?" he cried helplessly. "What the devil does this mean?"--turning to the police. "Do you know this fellow, Mr. Hamilton?" asked the chief. "Know him? Of course I know him," answered Teddy; "and I'll stake my last dollar on his honesty." (Thanks, Teddy!) I began to breathe. "But--" began the chief, seized with sudden misgivings. "It is impossible, I tell you," interrupted Hamilton. "I know this gentleman is incapable of the theft. There is some frightful mistake. How the dickens did you get here, Dicky?" And briefly I told him my story, my ass's ears growing inch by inch as I went along. Hamilton didn't know whether to swear or to laugh; finally he laughed. "If you wanted to come, why didn't you write me for an invitation?" "I shouldn't have come to your old ball, had I been invited. It was just the idea of the lark." "We shall have to hold him, nevertheless," said the chief, "till everything is cleared up. The girl--" Hamilton looked at the Blue Domino. "Madame, will you do me the honor to raise your mask?" [Illustration: "Madame, will you do me the honor to raise your mask?"] She did so; and I saw Hamilton draw in his breath. Her beauty was certainly of an exquisite pattern. He frowned anxiously. "I never saw this young woman before," he admitted slowly. "Ha!" cried the chief, glad to find some one culpable. "Did you receive your invitation through the proper channels?" asked Hamilton. "I came here to-night,"--coldly, "on the invitation of Mrs. Hyphen-Bonds, who sailed for Europe Wednesday." Here was an alibi that was an alibi! I was all at sea. Hamilton bowed; the chief coughed worriedly behind his hand. The girl had told me she was an impostor like myself, that her ten of hearts was as dark-stained as my own. I could not make head or tail to it. Mrs. Hyphen-Bonds! She was a law in the land, especially in Blankshire, the larger part of which she owned. What did it all mean? And what was her idea in posing as an impostor? The door opened again. "The patrol has come," said the officer who entered.