In Montreal, the unemployed fashion designer Sophie Malaterre is shown a website, switch.com, where it is possible to switch houses with a stranger for vacation. Sophie seeks an apartment in Paris nearby the Eiffel Tower that belongs to Bénédicte Serteaux and they change apartments. Sophie arrives in Paris on Saturday morning. The next morning, policemen break in the apartment and arrest Sophie while she is having a bath. Detective Damien Forgeat interrogates Sophie believing that she is Bénédicte and she learns that a beheaded body was found in her room and all evidence of her life has been deleted.
Damien Forgeat

Sophie Malaterre

Stéphane Defer

Delors

Bénédicte Serteaux

Alice Serteaux

Verdier

Claire Marras

Marianne Malaterre

Kourosh

Koskas

Canadian Inspector

Inspector Lachaux

Japanese Girl

Agathe Huygens

Père Huygens

Pat

Psychiatrist
