Summer 1976, in the midst of a heatwave: in this investigation with the feel of a comedy, we are plunged into a small village in the Périgord, where a female gendarme who respects the military hierarchy with the intelligence and subtlety of a feminist, teenagers very much in step with their times, and Commandant Poussain, a former member of the vice squad, a chauvinist and a bit of a drinker, find themselves faced with a series of murders. Five, ten, no matter: what counts is the burning question on everyone’s mind locally: «But who killed Marcel?»