“It is only a suggestion,” said Holmes, suavely. “I frankly admit that I am unable to prove it. But it seems probable enough, since the moment that Mr. Soames’s back was turned, you released the man who was hiding in that bedroom.”

Bannister licked his dry lips.

“There was no man, sir.”

“Ah, that’s a pity, Bannister. Up to now you may have spoken the truth, but now I know that you have lied.”

The man’s face set in sullen defiance.

“There was no man, sir.”

“Come, come, Bannister!”

“No, sir, there was no one.”