It's the end of the season at Les Cimes, vacationers leave, the snow melts... and reveals the corpse of a murdered woman in an intriguing and macabre setting. Swiss captain Sterenn Peiry is in charge of the case, supported by French investigator Lyes Bouaouni because a body was found in a similar condition on the other side of the border. As the mystery deepens, the investigator discovers that her son accidentally killed his girlfriend in the car. Her life changes: how far will she go to protect her son?