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The unexpected disappearance of her troubled brother causes a nineteen year-old girl intense emotional distress as French filmmaker Philippe Lioret collaborates with author Oliver Adam to adapt Adam's popular novel for the screen. Upon returning from Barcelona after spending the summer with new friends Lea (Aissa Maiga) and Thomas (Julien Boisselier), Lily (Melanie Laurent) discovers that her twin brother Loic (Mickael Trodoux) has fled the family home following a particularly intense confrontation with family patriarch Paul (Kad Merad). When Loic fails to return Lily's increasingly desperate calls and her parents continually fail to explain the reasoning behind her brother's flight, the troubled girl lapses into an alarming emotional malaise in which she is unable to eat or sleep. Her health rapidly failing, Lily is admitted into a local hospital where she languishes until a letter arrives from her brother condemning the pair's father for ruining their lives. Upon recovering from her malady Lily sets out to locate her brother. It is a quest that will not only provide Lily with a better understanding of her faltering family dynamics, but set her down the path to womanhood as well.