July, Montreal, Canada. Sophie Malaterre, a 25-year old fashion illustrator, has steeled herself for a lonely summer in the city. She has no plans, no close friends around and no boyfriend... that is, until she hears about an apartment-swapping site: switch.com. Sophie is in need of a change of scenery and decides to give it a try. After all, what does she have to Lose? As luck would have it, she finds herself in a duplex in Paris, complete with a view of the Eiffel Tower. Paris is everything she has ever dreamed of and her first day there is idyllic. But, the next morning she meets with a rude awakening: as the police break down the apartment door, Sophie discovers she is sharing her apartment with a headless corpse. She has no way of proving that she is not B├йn├йdicte Serteaux, the owner of the premises. Sophie's fingerprints are on the murder weapon... B├йn├йdicte's passport has Sophie's photo in it. The walls close in. Sophie hasn't only switched flats...She's also switched identities... (Original Title: Switch)