After several coeds are murdered at a college, a professor who is who is having an affair with one of his students becomes a suspect. When other gruesome murders start occurring shortly thereafter, the teacher suspects that he may be the cause of them.

An unidentified fifteen year-old girl is found hanged after an anonymous tip-off. The girl, Silvia Polvesi, is soon discovered to have been murdered. A peeping tom is caught with photos of her having sex with a teenage drop-out but he is later released due to lack of evidence. The investigation, conducted by Inspector Silvestri and ...

London, England. Dorian Gray is a young man who somehow keeps his beauty eternally, while a mysterious portrait of himself gradually reveals his moral decay.

Renowned gunman Richard Martin is traveling on a train, held up by Billy Kane, a former student of Martin's. Kane spares Martin, but only after shooting his hands. Years later, Martin meets an escaped convict, wrongly convicted for the train robbery. Martin trains his new student and both men seek out Billy Kane.

The titular medallion is a gift presented to young Nicole Elmi. Once the girl places the gift around her neck, she is possessed by the spirit of a dead child who was a murderess.