Agatha Christie's grisly plot is so good, movie adaptations just can not mess it up, and even this prosaic 1965 version, filmed in large and austere, airy sets that undo the plot's claustrophobia, manages to be thrilling - keeping things fresh is the setting of a snowed-in mansion (not an island off the Devon coast), some deaths from great mountain heights, and a hilarious but oddly effective "Whodunnit break" (a one-minute pause with a voice-over that prompts audience members to turn to their neighbour and hazard a guess at whodunnit!)
★★★☆☆
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