premise: 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? 46 "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?"
hypothesis: The mistress in question is the head of the vampire clan and she has a green dress.