This movie begins a little like William Irish's aka Cornell Woolrich's " I married a dead man " (the novel was released well before Leisen's movie ,in 1948),the concentration camps replacing the derailment:and then a poor girl becomes an impostor in a wealthy family;then after introducing a Rebeccaesque governess,the story takes a divergent turn ,recalling sometimes "gaslight" "suspicion" (the glass of orange juice replacing the glass of milk) and "sudden fear" which would be released the following year.
That said,the movie is good,suspenseful,sometimes excellent and shows how great Robert Wise is as a director when he creates a disturbing atmosphere in an old house;he would take his skill to its absolute perfection with "the haunting" (1963) IMHO the best movie ever made about a haunted house (the remake should be carefully avoided);his talent emerges here and there: the playhouse where a wall is missing,the branch behind the curtain,the shadow on Valentina Cortese's white dress in the garage and the picture of the late old lady who seems like a judge beyond the grave ;her expressive face seems to have changed in the last pictures .Best performance comes from Richard Baseheart who shines in his last minutes on screen and the rest of the cast rises to the occasion.