“No, sir, not then, but I expect she did later. She usually did lock it at night. The door into the passage, that is.”

“Did you notice any candle grease on the floor when you did the room yesterday?”

“Candle grease? Oh, no, sir. Mrs. Inglethorp didn’t have a candle, only a reading-lamp.”

“Then, if there had been a large patch of candle grease on the floor, you think you would have been sure to have seen it?”

“Yes, sir, and I would have taken it out with a piece of blotting-paper and a hot iron.”

Then Poirot repeated the question he had put to Dorcas:

“Did your mistress ever have a green dress?”

“No, sir.”