Several people are brought to a house on a deserted island by a mysterious man they've never met named U. N. Owen, and they are killed off one by one.
This is one of the basic Old Dark House premises given the grand treatment in this Agatha Christie mystery. A memorable cast of character actors fills the movie, including Walter Huston, Barry Fitzgerald, Mischa Auer, Roland Young, Judith Anderson, Richard Haydn and C. Aubrey Smith. It is quite entertaining to see these people all starting to get very suspicious of each other, especially whenever there are only two of them together at the same time. Unfortunately for me, I'd read the stage play some time ago, so I knew who the culprit was, but I think the movie does a good job of keeping the identity of the killer a secret till the end. This one is definitely worth catching, even if it is only marginally a horror movie.