“All right, Professor,” he grinned. “I believe you mean every word you say. Nevertheless, I’ll just keep the guns.”

Marakinoff bowed, imperturbably.

“And now,” he said, “I will tell you what I know. I found the secret of the door mechanism even as you did, Dr. Goodwin. But by carelessness, my condensers were broken. I was forced to wait while I sent for others⁠—and the waiting might be for months. I took certain precautions, and on the first night of this full moon I hid myself within the vault of Chau-ta-leur.”

An involuntary thrill of admiration for the man went through me at the manifest heroism of this leap in the dark. I could see it reflected in Larry’s face.