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My Brother-in-Law Killed My Sister (French: Mon beau-frère a tué ma soeur, is a 1986 French comedy thriller film directed by Jacques Rouffio. It played in competition at the 36th Berlin International Film Festival. In the film, two members of the Académie Française agree to help attractive young veterinarian Esther investigate the suspicious death of her sister. Esther is convinced her brother-in-law is responsible, but soon it becomes apparent that those responsible are linked to the very highest echelons of power in the Vatican.