The tired cop accepts to kick people’s butts for 500 €, no questions asked. With dirty hands but an almost clear mind, he begins to understand that he has been beating up intellectuals, journalists, who never defend themselves. When he realizes who the "client" is, the case takes a different turn...
One night, he decides to ask his victim some questions before beating him up ; he understands some of it and ends up embarking to Marseille, looking for a veteran from the Algerian War. The novel turns into a road-movie, concurrently with the story of a barracks during the dirty war : a microcosm of tension and horrors.