Switch - 2011

A French film. Sophie Malaterre (Karine Vanasse) is a Canadian unemployed girl and one day a woman suggests a change, a vacation: exchange your house with someone else in the world and have a cheap vacation! Sophie is all yayyy what a fantastic idea, to have a complete stranger stay in my house! and she goes on that site, switch.com and arranges it with a French girl: Bénédicte Serteaux (Karina Testa). They do all by mail and email, they never meet. Sophie goes to Paris all happy, she can see Tour Eiffel so near from this house! Next day she wakes up feeling sick, has a shower (first time we see her naked, but not the last. She's beautiful, yes, but the story didn't need either this or the other naked showers..) then the police barge in and arrest her, charging her with the murder of a guy: Thomas. She tries everything to convince them she's Sophie, not Benedicte, but it's all against her. The site has been cancelled, the blood type is the same... so she tries with: call a dentist, if it works for the dead it'll work for the living, but the stupid dentist cares only about his tennis match , nothing for her life, so she reacts and escapes. She takes Detective Damien Forgeat (ex football player Eric Cantona)'s gun and starts running away. She gets some money robbing a cute Japanese girl in a Fiat 500, uses them to buy new clothes at a shop own by what seems to be the only good man in Paris at the moment, and starts her search for anything that might prove her identity. She's quite good and smart, I was liking her a lot, but then she does something I would have never done: she calls her mother in Montreal telling her to go and take her documents at her house. Sure, she tells her to call the police, but didn't she know her mother? She calls nobody and goes there with a rifle, only to get her throat cut by Benedicte. Come on, to send your own mother to a murderer's house! Okay, she was in a terrible situation, but everyone's first concern should be to keep their family away from such danger, not send her right into it!
A couple of showers/baths and some more running, and Damien starts believing her. He finds out that Benedicte and dead Thomas were born with artificial insemination from the same donor: Sophie's father when he was out of money.
Benedicte wanted revenge, and she comes back to close it with Sophie. She gets her and takes her to a isolated place; this time it makes perfect sense that she doesn't simply shoot Sophie, because that's too simple and is not what she needs, but stupidly she doesn't take away Sophie's cell phone. Sophie calls Damien: she can't talk but they trace the call and get there in time to shoot Benedicte before she kills the hated sister who grew up with a loving father. It ends right there, with Sophie repeating: I'm not Benedicte!