Free at last of family constraints, Sam enjoys happy times with a newly divorced Antoine, who has moved back to Franconville for good. But the fragile happiness Sam has finally managed to forge is short-lived. Her son Alex shows up at her door with a bad case of love blues. Then her father, who's been out of her life for 47 years, suddenly decides he needs to meet his grandson. At the middle school, a rebellious pupil has been giving Sam a hard time... and putting him back in his place will prove to be no easy task.

Sam wrangles with accusations leveled by her student Matthieu, who she accidentally knocked down with her car. When the police call her in for questioning, Sam fails to grasp the seriousness of the situation, her mind preoccupied by her father's unexpected return. All riled up, Sam rushes over to her father's house, totally unaware that she's going to be meeting her brother Olivier and her sister Sonia for the very first time.

Furious with her father and stunned to find out she has siblings, Sam flees her father's house and vows to never see her newfound family again. She's got other worries on her mind. Her meeting with Lieutenant Montel doesn't go as well as hoped. Sam plays it cool and detached, which irks the lieutenant, who seems determined to make her pay dearly for causing the accident.

Antoine steps in to try and get Sam's life back in order. Not only does he schedule an appointment with an attorney for Sam, he also asks her to marry him. But it only makes Sam mad: she hates it when anybody tries to force her hand. To make matters worse, Xavier is fretting about his future and Lieutenant Montel is questioning students at her school, which has her worried. With good reason. When Sam gets home, she comes face to face with a policeman who's there to arrest her.

Sam spends the night in a jail cell. Her case turns out to be serious. She is formally charged. Sam's personal life is getting incredibly complicated as well. She officially turns down Antoine's marriage proposal. Then she finds out the only reason her father came back was to make a desperate ploy to get her to donate one of her kidneys... to save her brother's life.

Sam is really down in the dumps now. After being betrayed by her new family, Antoine breaks up with her after she refuses to marry him. Alone and sad, Sam can't see the light at the end of the tunnel. What's more, her organ donation compatibility tests come back as a “match,” which means she's the only one that can save Olivier. But Sam still hasn't wrapped her head around the idea of giving her brother the ultimate gift.