"Well?"
"The letter will be opened."
"Sir," broke in Number Fifteen. "This is bluff. The prisoner has not sent any letter. He has been strictly watched for many months."
"Ah! but listen. I left the letter before I came to Lambeth."
"Then it can contain no information of value."
"Oh, but it does."
"What?"
"The combination of my safe."
"Indeed? Has this man's safe been searched?"
"Yes, sir."