When British diplomat Peter Jones (Anthony Higgins) suspects his wife (Charlotte Rampling, playing it totally straight) of infidelity, he is stunned to discover that the ‘other man’ is a chimpanzee. On a whim, he invites his hairy rival to move into the luxurious family home – more out of curiosity than jealousy – leading to uncomfortable dinner parties, volatile shoot-outs and an increasingly skittish maid.