Therefore it must have been Mrs. Cavendish who entered the deceased's room through the door communicating with Mademoiselle Cynthia's room."
Mrs Cavendish must have entered the room through a window.
mnli hypothesis: Mrs Cavendish must have entered the room through a window. premise: Therefore it must have been Mrs. Cavendish who entered the deceased's room through the door communicating with Mademoiselle Cynthia's room."