French horror directed by Jess Franco and starring Diana Lorys and Paul Muller. When Cynthia Robins (Colette Giacobine), a dancer in a Zagreb nightclub, moves in with new recruit Anna de Istria (Lorys) a strange relationship develops between the pair. Obsessed with bloody visions, Anna lives in fear of schizophrenia. Her horrible nightmares make her question whether she is simply mad or truly a cold-blooded killer.