It occurs to nobody that Mrs. Cavendish has not arrived with the rest, but ”and this is significant ”I can find no one who saw her come from the other wing." He looked at Mary Cavendish. 
Mrs. Cavendish has not arrived with the rest
mnli hypothesis: Mrs. Cavendish has not arrived with the rest premise: It occurs to nobody that Mrs. Cavendish has not arrived with the rest, but ”and this is significant ”I can find no one who saw her come from the other wing." He looked at Mary Cavendish. 