The third screen version of Agatha Christie's 1939 whodunnit, featuring a host of great British screen actors including Dennis Price, Wilfrid Hyde-White and Stanley Holloway, and, strangely enough, the American teen pop idol, Fabian. Ten strangers, who all harbour their own guilty secret, are lured to a remote mansion on the Austrian Alps in the middle of winter. They have been invited by a mysterious host (whom none of them has met) called Mr U.N. Owen (the uncredited voice of Christopher Lee), and it's not long before they all start popping their clogs, one by one. It soon becomes apparent that one of their party is the killer, but which one?