When the murder of a local hero rocks a small Alpine village, no-nonsense cop Awa Sissako is sent from the Parisian suburbs to investigate and is forced to face her own demons in the process.
The story opens in the present day, at a high school reunion in the south of France where three former friends reconnect. They grew apart and lost touch, but they are still bound by a tragic secret tied to the disappearance of a high school girl who went missing 25 years ago in the region.
