===Story=== An emotionally subtle film with some surprisingly graphic sex, ''Come Undone'' follows 18-year-old Mathieu (Jeremie Elkaim) as he goes on holiday with his depressed mother, her cranky caretaker, and Mathieu's resentful younger sister. At the beach, Mathieu meets Cédric (Stéphane Rideau), a handsome teenager with whom he begins a romance after a kiss in the moonlight. Their relationship is threatened by Mathieu's fears of how his family will react and by a violent former lover of Cédric's, but ultimately is brought to an end by something else entirely. ''Come Undone'' shifts fluidly back and forth in time and can be confusing, but by the end it's an affecting portrait of both love and melancholy. Some will find the movie worth seeing just for the many shots of the extremely attractive naked actors romping on the beach. ''--Bret Fetzer''