Emma Orczy

“ Hence the story of the diamonds found in the garden of No. 22. The cunning rogues guessed that the usual plan would be acted upon, and the suspected thief allowed to visit the scene where his hoard lay hidden.
"It had all been foreseen, and Robertson must have been constantly on the watch. The tramp stopped, mind you, in Phillimore Terrace for some moments, lighting a pipe. The accomplice, then, was fully on the alert; he slipped the bolts of the back garden gate. Five minutes later Knopf was in the house, in a hot bath, getting rid of the disguise of our friend the tramp. ”

“ Shipman and Mr. Knopf? Firstly," he said, putting up an ugly claw-like finger, "Mr. Shipman, then Mr. Knopf, then, presumably, the man Robertson."
"And the tramp?" said Polly.
"Leave the tramp alone for the present since he has vanished, and take point number two. Mr. Shipman was drugged. That was pretty obvious; no man under ordinary circumstances would, without waking, have his keys abstracted and then replaced at his own bedside. Mr. Howard suggested that the thief was armed with some anaesthetic; but how did the thief get into Mr. Shipman's room without waking him from his natural sleep? ”