Diane (Virginie Efira) is a beautiful woman. A very beautiful woman. A brilliant lawyer, she has a sense of humor and a forceful personality. And as she has just put an end to her marriage, which was not making her happy, she is at last free to encounter the man of her life. As chance doesn't exist, Diane receives a phone call from a certain Alexandre (Jean Dujardin), who had found the mobile phone that she'd lost. Very quickly, something happens during the phone call. Alexandre is polite, funny, obviously cultivated... Diane is charmed. They quickly arrange a date. But their meeting won't go at all as planned.