Two French girls get lost in the woods and accidentally enter the realm of sorceress Morgana Le Fay - who gives them the choice of either staying young forever as her lovers, or rot in a dungeon for eternity.

Yves grows up with his attractive blonde aunt. Her affair and the handling of his awakening sexuality make him a voyeur, and witnessing her murder at the hands of her brutal husband turns him into a sex killer as an adult.

Paris, in the 1960s. A series of crimes troubles the public tranquility. On March, 22, 1968, Hélène Picard, a prostitute sentenced to death two years before for several murders, is killed by executioner Louis Guilbeau. Immediately, the violent crimes, similar to Hélène’s ones, go on again. In parallel, Louis is having an affair with the police woman in charge of the investigation… What are the obscure relations hidden behind the executioner and the mysterious killer? Who is this dark man in reality?