In a French thermal town, a man is found poisoned. His ex-girlfriend is arrested for the murder but her estranged cop daughter tries to prove her innocence which leads her much further than she could have ever imagined.

Elisa, a fiery and passionate teenager, wants to enjoy the summer of her 17 years on the steep slopes of the Vercors where she grew up. But her mother leaves the house and leaves her alone with her father to look after her disabled sister. An increasingly heavy responsibility that makes love switch to hatred.

Several notables from the Chamonix region are found murdered in their homes. To move forward with investigation, police captain Thomas Delhaye decides to release Juliette Hémon from prison, imprisoned for a strangely similar case.