After 20 years of absence, Captain Fred Carel returns to the small town of Provence where he grew up. With Sara, his former high school friend who became a lieutenant in the local Gendarmerie, he must investigate Antoine Bernier's death.
Alexis Pasquier, a young French teacher, begins his first day of classes at the Nancy prison. There he meets Léa, a young woman with whom he falls madly in love. Two worlds open up to him: true love and the prison environment. He will never be the same anymore.
Louise, a doctor and mother, is suddenly caught up by her past after the discovery of her step-father's body, 18 years after he went missing.
Cécile adopted Benjamin at the age of two and has managed over the years to create a harmonious balance with the young boy. She is considering marrying Marc, a divorced engineer and father of two, when she receives a call from Francis Haudrant, her son's biological father. Panicked at the idea of losing him, Cécile agrees to meet him. He tells her that Benjamin's mother died when he was two months old and that he served five years in prison before going to live in Africa. Now a suburban mechanic and about to become a father again, he feels the need to know what happened to his son.
Marc, a truck driver appreciated by all his colleagues, lives with his son Lucas, 14 years old. Widowed, he assumes the parental responsibilities alone. However, he spends most of his time on the road. One day, on his way to Marseille with Lucas, a car runs a stop sign and there is an accident. Lucas gets out of it with a few scratches, but Marc falls into a coma. When he wakes up, he learns from the doctors that his optic nerve has been affected. Little by little, he loses his visual acuity until he becomes blind. Marc accepts the news and begins a different life, surrounded by his family...
