“You were taking a risk—a big risk—coming undisguised,” he said.

“But I am disguised,” said Philo Gubb. “These here is false whiskers and hair.”

“What!” exclaimed Jack Harburger. “Wonderful work! A splendid make-up, detective! You fooled me with it, and I was on my guard. You’ll do. Bend down like an old man. That’s it! Now, listen: I have cut a hole through the wall from your room into Jack’s. You can hear every word he speaks. Have you pencil and paper? Good! Jot down every word you hear. And don’t make a sound. If you are discovered—well, they’re a desperate gang. Come!”

He led the way through a long, dark corridor that turned and twisted. At the extreme end he stopped, put down the telescope valise, and drew a key from his pocket.

“That’s Jack’s room,” he breathed softly, “and you go in here. Sorry it isn’t a better room. We had to use it, and you won’t be here long, anyway.”

He opened the door. It was a large door that swung outward, and it occupied one half of one side of the room. The floor of the room was carpeted, and the walls were papered, as was the ceiling. There was no window, but an electric light burned in the center of the ceiling. Across the far side of the room stood a narrow iron bed, with a small bureau beside it. Jack Harburger pointed to a hole in the wall-paper.

“That’s your ear-hole,” he whispered, and Philo Gubb stepped into the room. Instantly the door slammed behind him, the key turned in the lock, and he heard a heavy iron bar clank as it fell into place outside. He was a prisoner, caught like a rat in a trap, and he knew it! He threw himself against the door, but it did not give. The electric light above his head went dark. He put out his hand, and the wall gave slightly. He drew the revolver and waited, dreading what might next occur. He heard soft footsteps outside the door, and, raising the revolver, pulled the trigger. The trigger snapped harmlessly. He had been tricked, tricked all around.

“Is the oubliette prepared?” whispered a voice outside.

“All ready for him. Twelve feet of water. He’ll drown like a rat.”