"And couldn't George, the sergeant, see that my door was locked?"

"Why, no, sir, I couldn't. At any rate, I didn't," says the trooper, rather nettled.

"Have you changed your mind? Or are you in the same mind?" Mr. Tulkinghorn demands. But he knows well enough at a glance.

"In the same mind, sir."

"I thought so. That's sufficient. You can go. So you are the man," says Mr. Tulkinghorn, opening his door with the key, "in whose hiding-place Mr. Gridley was found?"

"Yes, I AM the man," says the trooper, stopping two or three stairs down. "What then, sir?"

"What then? I