“I must hurry back to the hotel.”

“So must I, Wilson.”

They arrived at the gate. Wilson, who was ahead, took hold of it and pulled.

“Ah! you closed it?” he said.

“No, I left it partly open.”

Sholmes tried the gate; then, alarmed, he examined the lock. An oath escaped him:

“Good God! it is locked! locked with a key!”

He shook the gate with all his strength; then, realizing the futility of his efforts, he dropped his arms, discouraged, and muttered, in a jerky manner:

“I can see it all now—it is Lupin. He foresaw that I would leave the train at Creil, and he prepared this neat little trap for me in case I should commence my investigation this evening. Moreover, he was kind enough to send me a companion to share my captivity. All done to make me lose a day, and, perhaps, also, to teach me to mind my own business.”

“Do you mean to say we are prisoners?”