L'heure zéro

Camilla Tressilian, a wealthy elderly woman who lives on the Breton coast, has her nephew, Guillaume, his wife, Caroline, and his ex-wife, Aude, come stay at her cliff side home for the holidays. Thomas, a family friend and frequent traveler, also comes for a visit.

One evening, the visit of yet another guest begins a series of events which culminate with the murder of the old woman. Parisian police chief Martin Bataille, on holiday at the coast, enters on the scene to try to solve the crime.