As the village of Bozouls prepares to celebrate the upcoming eclipse, local police officers Manue and Johanna get together for the event; when a young woman named Nour disappears after a terrible accident, Manue and Johanna investigate.

As the search for Nour intensifies, Prosecutor David Levy is assigned to the case and questions her friends; Manue's son, Luca, insists he had nothing to do with Nour's disappearance, but a dark secret about his relationship with her comes to light.

When Nour's body is found, the investigation becomes a murder case; after discovering that she had secret ambitions while having an affair with an older man, Manue and Johanna suspect that Nour fell into a trap that led to her death.

With the investigation now focused on Manue's nephew, Quentin, an inquiry unearths a shocking past between him and Nour; Manue is horrified to find out that the boy she has seen grow up has a disturbing profile that makes him their prime suspect.

Just when the investigators think they've found their culprit, an unexpected twist reshuffles the cards; despite David's suspicions, Manue and Johanna refuse to believe that Angèle and Luca played any part in the crime.

David orders a reconstruction of the case to help discover who murdered Nour; off the investigation and estranged over the accusations against their children, Manue and Johanna must put their differences aside to solve the case.