Jean-François Robignac, a teacher, arrives at a provincial college to teach literature to ninth-graders. He quickly wins over the children with his youthful way with words. But his parents want to have him expelled when they learn that Jean-François uses slang words to rejuvenate writers' texts.
The maid of a clandestine brothel in Marseille is found murdered. The inspector Sergil, in charge of the investigation will employ somewhat particular methods in order to unmask the assassin.
