The ski season is coming to an end at Les Cimes, vacationers are leaving, the snow is melting… and it uncovers the body of a woman murdered in a gruesome yet intriguing way. Swiss detective Sterenn Peiry is assigned to the invesgation, joined by French detective Lyes Bouaouni because a corpse has been found With the same gloomy staging in France. While the mystery gets thicker, Sterenn finds out her son accidentally killed his girlfriend in a car crash. Her life turns upside down: how far will she go to protect her son?