Twenty years before Jack the Ripper rages in Britain, Paris is experiencing a wave of murders of prostitutes particularly violent. From 1861 to 1866, nine girls of joy, as well as the child of one of them, were slaughtered by an individual whom the police could not apprehend. Many witnesses describe him as a disturbing-looking worker, with a somber gaze and a tattoo on his arm, who proclaims "Born under a bad star". This sad character persists on his victims, strikes them with numerous stabs, with such violence that he sometimes fails to decapitate them. He was finally arrested on January 11, 1866, after an attempted murder of a painter. His name is Louis-Joseph Philippe and has all the characteristics of the psychopath.