She put out both her hands, with a gesture of enchanting frankness. "I will believe anything you tell me," she said; "I know you would not deceive me."

He took the two little fluttering hands in his, and raised them one after another to his lips.

"I see you are not wearing a sling," she remarked. "Is your arm healed?"

"It was nothing; a broken collar-bone is quickly cured," he said carelessly, though delighted by even so slight a token of interest from her. "Besides, the person whose domino I borrowed, does not wear his arm in a sling, and I do not wish any difference to be remarked when he resumes it."

"Then you are here in some one else's disguise?" she said quickly. "What will you do when we unmask?"

"At midnight the right face will be found under this mask," he replied.

"What fun it would be!" she cried, with reckless gaiety, "if you were to stay until midnight and unmask with the rest! I wonder if any one would recognize you."

"If the experiment will amuse you, I will stay and try it," said Robin tranquilly.

Her own voice dropped almost to a whisper. "To amuse me?" she murmured. "What do you suppose would happen?"

"Probably nothing at all; I am not so well known. At the worst, they would merely arrest me," he said.