"This is Inspector Field of Scotland Yard," Mark said.

Mary's lips quivered, but she said nothing. Her own instincts told her what Field was doing here. She had always felt that the bubble must burst some day—she had always known that her noble efforts were altogether in vain. And yet she would have gone on sacrificing herself to save Carl Sartoris from the fate that was inevitable.

"Are you down here on any special business?" Mark asked.

"On business connected with the disappearance of Sir Charles Darryll and other matters," Field said. "The one thing contains the other. But you need not have the smallest apprehension for the safety of Mrs. Richford and her diamonds. She is not going to lose them."

"How did you know that she had those diamonds in her pocket?" Mary asked.

"You forget that I have been hiding here," Field explained. "Like yourself, I heard every word that passed just now. Every moment I expect to have two of my most trusted men here. Directly those two emerge from the house and get into the road, they will be arrested. In my business I often find that when you are looking for one bird you frequently find another. Mr. Reggie and Miss Cora are old friends of mine and the Paris police. They are very clever at disguises; they work together, she as a countess, and he as a general officer. Both of them were on the stage and both would have made very good names, but the honest rôle was too dull for them. You may rest as

sured that those two will be out of the way before daylight."

Mary listened with mixed feelings. She felt that in a measure she was mainly responsible for what was going to happen. It looked as though it would be an eventful evening.

"Well, we can't stand here all night," Mark said impatiently. He was vaguely frightened for Beatrice, in the house with those rascals. "I can help you. You and I together would be a match for the lot of them. What do you say to try?"

But Field had no feeling that way at all. The cool, shrewd officer did not rush things in that fashion. He had his birds secured and he could afford to wait.