In the Alps, a caravan burns, enclosing a seasonal worker in its flames. Emilie Karras, a young gendarme from Lyon, originally from Les Clairies, leads the investigation, forced to collaborate with Major Servoz, a disillusioned local gendarme.
A telephone operator in a suicide prevention center, Charlotte recognizes the voice of an ex-girlfriend, Lucile, whose determination to end her life is confronted with feelings that are soon rekindled by their reunion.
