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This sophisticated black comedy sex romp is based on the novel by Iris Murdoch, which she also turned into a stage play (with J.B. Priestley). Ian Holm, is hapless wine-taster Martin Lynch-Gibbon who has both a mistress (Jennie Linden) and a nymphomaniac wife, Antonia Lynch-Gibbon (Lee Remick). His best friend, psychiatrist Palmer Anderson (Richard Attenborough), is having an affair with Antonia. Palmer's half-sister Honor Klein (Clair Bloom) is having sexual relations with him also, which he is slightly apologetic about. The wine taster has had a lifelong antagonism for his friend's half-sister, but after his wife and mistress leave him, he takes up with Honor.