“Key is in the lock all right, sir,” he said, rising. “On the inside. Mr. Ackroyd must have locked himself in and possibly just dropped off to sleep.”

I bent down and verified Parker’s statement.

“It seems all right,” I said, “but, all the same, Parker, I’m going to wake your master up. I shouldn’t be satisfied to go home without hearing from his own lips that he’s quite all right.”

So saying, I rattled the handle and called out, “Ackroyd, Ackroyd, just a minute.”

But still there was no answer. I glanced over my shoulder.

“I don’t want to alarm the household,” I said hesitatingly.

Parker went across and shut the door from the big hall through which we had come.