Montreal, Sophie Malaterre, fashion designer without a job, is summoned by Claire Maras to present their ideas boss. When you arrive at the company, Claire apologizes and tells Sophie that the boss is away on vacation and did not return for another two months.
Claire invites Sophie to lunch and tells about switch.com site where it is possible to swap apartments for holiday period. Sophie visits the site and choose an apartment in Paris that belongs to Bénédicte Serteaux and the two exchange apartments.
Sophie reach Paris, installs in beautiful apartment near the Eiffel Tower and spend a wonderful day visiting the surroundings. The next day but police enter the apartment and arrest. Damien forces a detective interrogates believing it is Bénédicte and Sophie find that in Parisian apartment was found a corpse …