“No; he is clean dazed. He just knows that he was lifted up as if by magic and dropped as if by magic. Two a least were in it, and maybe three.”

“And you connect this attack with your lodger?”

“Well, we've lived there fifteen years and no such happenings ever came before. I've had enough of him. Money's not everything. I'll have him out of my house before the day is done.”

“Wait a bit, Mrs. Warren. Do nothing rash. I begin to think that this affair may be very much more important than appeared at first sight. It is clear now that some danger is threatening your lodger. It is equally clear that his enemies, lying in wait for him near your door, mistook your husband for him in the foggy morning light. On discovering their mistake they released him. What they would have done had it not been a mistake, we can only conjecture.”

“Well, what am I to do, Mr. Holmes?”

“I have a great fancy to see this lodger of yours, Mrs. Warren.”

“I don't see how that is to be managed, unless you break in the door. I always hear him unlock it as I go down the stair after I leave the tray.”

“He has to take the tray in. Surely we could conceal ourselves and see him do it.”

The landlady thought for a moment.

“Well, sir, there's the box-room opposite. I could arrange a looking-glass, maybe, and if you were behind the door—”

“Excellent!” said Holmes. “When does he lunch?”