A gymnasium, a country town unhealthy like most of the people who live there... and terrible sex crimes. While everyone minds his own business a dangerous maniac kills all the women who unluckily meet with him. It is not simple to identify the killer especially because his violent deeds come of being manipulated by someone on the outside.

Coralba, since returning from a trip to Tuscany, shows signs of mental imbalance. Three friends of hers, who are part of a detective association about paranormal phenomena, investigate to find out the reason for her discomfort.