On a winding road in the Pyrenees, a spectacular car accident turns out to be miraculous: the reappearance of Anna, a teenager who disappeared 5 years ago. Captain Alix Stern and Commissioner Balthus are deployed alongside Victor Ferrer, the head of the local gendarmerie, to embark on a race against time. Find the trace of Lucie, a young girl kidnapped at the same time as Anna and who has not reappeared...