French-language thriller in which a woman's attempts to spice up her life through switching apartments goes disastrously wrong. Sophie Malaterre (Karine Vanasse), a Montreal fashion designer, believes herself to be at a dead end. With no active fashion projects, no boyfriend and no friends, she wonders how she will fill the hours of her forthcoming summer vacation. When she hears about a website, SWITCH.com, where members can arrange to swap apartments for a time, she wastes little time getting in contact with B�n�dicte Serteaux (Karina Testa), who owns a duplex overlooking the Eiffel Tower. Sophie's first day is like a dream, every bit as enjoyable as she'd hoped, but her second is a nightmare. She is awoken by the police, led by Detective Forgeat (Eric Cantona), who have discovered a dead body in the duplex, and seem unable to distinguish Sophie from B�n�dicte...