Judge Claire Delval discovers that her father, Simon Delval, is involved in the corruption case she has been investigating for years. Forced to resign, his place in the Francophone Liberal Party is coveted by the discreet Mark Van Dyck.

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.