At 50, police commander Agathe Koltès is beautiful, funny and charming. She’s about to take up a post in a small town in Brittany, where everybody is anxiously awaiting her arrival. Everybody except Mathilde Sirach, the young police captain who is fiercely opposed to her coming. What nobody knows is that Mathilde is actually Agathe's daughter, and that they haven’t seen each other in years. The mother-and-daughter reunion is stormy, but soon their investigations lead them to rediscover the strong bond they share.