A young woman wakes up in hospital after a car accident. Completely amnesiac, she has forgotten everything, including her identity. But the police recognise her as Marina Masson, a girl kidnapped eleven years ago.

Marina secretly meets someone called Maël, with whom she's planning to run away. Marina's father, Laurent, finds an identity card bearing the name of Alexandra Martinez in a jacket Marina lost, and it raises questions.

Alex/Marina discovers the joy of having a family and a loving mother, making her little sister Éléonore very jealous. She decides to become Marina for good and breaks off with Maël.

A mysterious correspondent contacts Alex/Marina and threatens her: he knows her identity and will report her to the police if she doesn't do everything he says; Laurent and Hélène grow closer and end up spending the night together again.

Hélène admits that eleven years earlier, Marina ran away after surprising her with her lover; Superintendent Victoire Eberhart discovers that the man who has been pulling the strings since the beginning is none other than Paul, her lieutenant.

In Ivan Claes' trunk, Laurent discovers a bloody towel and Marina's bracelet. He gives them to Paul for analysis, but the latter burns them. Laurent drags him into the forest, ready to kill him if he won't tell him where his daughter is buried.