“So we went up and, would you believe it, the flat wasn’t let at all. We were shown over it by the maid, and then we saw the mistress, and the thing was settled then and there. Immediate possession and fifty pounds for the furniture. We signed the agreement next day, and we are to move in tomorrow!” Mrs. Robinson paused triumphantly.

“And what about Mrs. Ferguson?” asked Parker. “Let’s have your deductions, Hastings.”

“ ‘Obvious, my dear Watson,’ ” I quoted lightly. “She went to the wrong flat.”

“Oh, Captain Hastings, how clever of you!” cried Mrs. Robinson admiringly.

I rather wished Poirot had been there. Sometimes I have the feeling that he rather underestimates my capabilities.