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.

Solly Bertone, whose real name is Solange Berton, is ending her 32-year career as a senior flight attendant on Hexagone Air flights. After five years of enduring domestic flights with the low-cost subsidiary, she is hoping for one last prestigious trip. But during her final briefing at Roissy, she discovers that she has been assigned to a flight to Bergerac, a destination that infuriates her.