Road to Salina

Road to Salina French La route de Salina is a 1970 French film, a psychological thriller directed by Georges Lautner. It stars Robert Walker, Jr., Mimsy Farmer and Rita Hayworth. The film is based upon Maurice Curys novel Sur la Route de Salina. A FrenchItalian coproduction, it was shot in English in the Canary Islands.

When Billie, his alleged sister, comes home, Jonas thinks that the game is over and that hell finally be unmasked as an impostor. But even the attractive and carefree Billie appears to recognize him as her brother and soon takes him under her wing. They spend the days together, and after skinny dipping in the ocean, an erotic relationship develops between them. Everything seems to be fine and Jonas begins to relax in his new role as Rocky. Mara, Billie and Warren enjoy a dinner party together celebrating Rockys return.Realizing that Billie is having a passionate affair with her alleged brother, Mara and Warren fear that the harmony that had so recently returned would soon be broken. Uneasy, Jonas becomes increasingly interested in finding out the reasons for the disappearance of the true Rocky. He gets the first clues in his search from Warren who, never outwardly expressing any doubt that he is Rocky, mentions during the conversation the name of Rockys girlfriend, Linda, who runs a local restaurant. In search of answers, Jonas goes to Salina and finds Linda at the restaurant. He drops a glass at the bar to draw attention to himself, and finds that Linda is the first person who fails to recognize him as Rocky. Back at the house, Jonas steals some old photographs from Billies bedroom that confirm his suspicions that he does not even resemble the real Rocky. When he confronts Billie with the truth, she tells him that she lied to protect Mara and that she loves Rocky and wanted him back. ........

Source: Wikipedia