I believe, Miss Howard, that it was you who found this sheet of brown paper? He held up the same dusty piece which Poirot and I had examined in the morning-room at Styles. 
Miss Howard found the piece of paper under a pile of dust.
mnli hypothesis: Miss Howard found the piece of paper under a pile of dust. premise: I believe, Miss Howard, that it was you who found this sheet of brown paper? He held up the same dusty piece which Poirot and I had examined in the morning-room at Styles. 