perhaps ten minutes, when there came a sound of voices and footsteps on the stairs. He awoke from his absorption, seemed to prick his ears, then slipped a leg over the window-ledge, and disappeared from sight down the ladder.
The door opened, and in came M. Formery, the Duke, and the inspector. M. Formery looked round the room with eyes which seemed to expect to meet a familiar sight, then walked to the other drawing-room and looked round that. He turned to the policeman, who had stepped inside the drawing-room, and said sharply, "M. Guerchard is not here."
"I left him here," said the policeman. "He must have disappeared. He's a wonder."
"Of course," said M. Formery. "He has gone down the ladder to examine that house they're building. He's just following in our tracks and doing all over again the work we've already done. He might have saved himself the trouble. We could have told him all he wants to know. But there! He very likely would not be satisfied till he had seen everything for himself."
"He may see something which we have missed," said the Duke.
M. Formery frowned, and said sharply "That's hardly likely. I don't think that your
