December 1959: A furious anticolonial war rages in Algeria. Captain Jacques le Garrec, a former detective and French Resistance hero, returns to France in disgrace. Traumatized after two years of working in the army intelligence services, he's now accused of a brutal crime.

As le Garrec awaits trial in the tiny Breton town where he grew up, he is asked to look into a disturbing and unsolved murder committed the previous winter. A local teenage girl was killed and her bizarrely mutilated body was left displayed on the heathland in a way that no one could understand.

Le Garrec's investigations draw him into the dark past of the town, still haunted by memories of the German occupation. As he tries to reconstruct the events of the murder, the violence of this crime and his recollections of Algeria intertwine, threatening to submerge him.