Only Agatha Christie could have conceived such a suspenseful thriller and then capped it with an uncanny triple flip ending. A young married man spends many evenings with a rich old woman. When she is found murdered, the naive young man is the chief suspect. The testimony of his wife is expected to result in an acquittal, but she is a shrew who damages his case and all but hangs him before a vindictive mystery woman appears with evidence that will change everything.