Dumbed down, wooden, and possessed of an ersatz "swinging '60s" feel, this Agatha Christie adaptation nevertheless remains watchable thanks to the old biddy's sturdy plot twists and the borderline camp appeal of the remarkably varied international cast. Although the source material has been leavened with premarital sex, gruesome murder scenes, and a Eurotrash setting, such second-stringers as Fabian and Shirley Eaton give the proceedings a TV-movie air, thereby saving director George Pollack from committing the worst sin of all: treating this patently silly tripe like a serious film. Shot in drab black-and-white, the movie looks like it was staged in a cavernous, leftover set from a glitzier spy thriller. Nevertheless, the pacing is brisk and the twists and turns engaging enough that 90 minutes go by rather painlessly. Christie's novel recieved a higher-concept treatment in René Clair's 1945 And Then There Were None.