Receiving treatment from a psychologist, Paul, for psychosomatic aches and pains, Chloé falls for him. Living together, she discovers that Paul has an identical twin, Louis, also a therapist, the ‘double’ in the title. An inevitable affair develops. Dualities run through the film, with allusions to Hitchcock – the score and a Vertigo-style spiral staircase, and a debt to Cronenberg’s Dead Ringers. A skin-tingling erotic thriller as only Ozon could construct.