In this suspense thriller inspired by the novel Eye of the Beholder by Marc Behm, Catherine (Isabelle Adjani), a serial killer, seduces men and then murders them just before moving on to the next victim. She spreads her mayhem through various countries in Europe, only slightly ahead of the mentally anguished detective (Michel Serrault) who tracks her -- he fantasizes she is his long-lost daughter and disposes of her trail of corpses to foil the police. Catherine pauses for a real love affair with a blind architect (Sami Frey) but the detective is overcome by jealousy and causes the man's death. This drives Catherine into despair -- and a return to her psychotic killing. As the police dragnet closes in, both Catherine and the detective are brought closer to a final confrontation with their internal demons.