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.

On a winter night in a ski resort in the French Alps, Mona, a young Italian seasonal worker, has locked herself out. She is struggling in the cold while looking for shelter. Her nighttime journey takes her near an unknown presence.

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.