“We have him. The house is surrounded.”

“But the servant’s stairway?” suggested Mon. Detinan.

“It leads to the court,” said Ganimard. “There is only one exit—the street-door. Ten men are guarding it.”

“But he didn’t come in by the street-door, and he will not go out that way.”

“What way, then?” asked Ganimard. “Through the air?”

He drew aside a curtain and exposed a long corridor leading to the kitchen. Ganimard ran along it and tried the door of the servants’ stairway. It was locked. From the window he called to one of his assistants:

“Seen anyone?”

“No.”

“Then they are still in the house!” he exclaimed. “They are hiding in one of the rooms! They cannot have escaped. Ah! Lupin, you fooled me before, but, this time, I get my revenge.”