One of two films Davis made where she played duel roles as twins - the other being less memorable.
Bette Davis stars alongside Karl Malden here, and despite the film's darker and more 'thriller' aspect, does have some very sentimental and moving moments between Malden and Davis.
This movie is enthralling from the outset and despite its length, does not appear over long. The story is 'classic' super-scenario fiction style, but is one of those situations, that could it happen in real life, people would probably behave in very much the same way; knowing - yet not really doing anything about it or telling anyone because of their doubts or suspicions seeming slightly crazy, and is probably why someone could get away with the plot!
This is great to the end, has some great camera trickery and illusions, and does not involve what could have been a drawn out and much-boring court scene that would have ruined the whole thing.
N. B. Though this is listed as a Region '1' DVD format, for some reason, this does play on a Region '2' Player!