Le juge et l'assassin (1976)

France, 1893. Joseph Bouvier, a former Sergeant in the French military, shoots his beloved and attempts to kill himself. Having survived with two bullets in his brain, he is released from the Dole medical facility, a place of mental and physical filthiness. Then begins a five-year period of wandering on the roads of the South East of France, during which Bouvier rapes and eventually kills two dozen defenseless shepherds and farm servants of both sexes. Judge Rousseau thinks this case would help his career as a right wing politician and therefore issues warrants of arrests to find any hobo fitting the description. But if Bouvier was declared insane, the Judge's plan may become a trap...