“Know him?”

“Yes, sir. He often come here.”

“Is he liberal to you?”

“Never give me a cent, sir.”

“Look here, I’ll give you ten dollars now if you do just as I say. It shan’t cost you your job and I’ll give you ten more. Sam, I’m a detective. I want that man, and I won’t get him out of here without a row—see!”

Sam’s eyes rolled until only the whites could be seen. I had displayed my shield.

“What can I do, sir?” he asked, pocketing the bill.

“That back door,” I whispered, “is it ever used?”

“Always, to go out of after midnight, sir.”

“And the gate?”