You yourself did not happen to notice, madame, when you entered Mrs. Inglethorp's room, whether that door was bolted or not?
Did you notice if the door Mrs. Inglethorp's room was locked or not?
mnli hypothesis: Did you notice if the door Mrs. Inglethorp's room was locked or not? premise: You yourself did not happen to notice, madame, when you entered Mrs. Inglethorp's room, whether that door was bolted or not?