George Stark is a wealthy industrialist who invites five business friends of his to his remote Mediterranean island for a weekend of relaxation and business when he introduces them to Professor Farrell, a brilliant chemist who gives investment ideas to the group. But against Farrell's wishes, the group goes behind each other's back to obtain information on Farrell's chemistry ideas and soon the guests and residents start turning up dead one by one as Stark and Farrell must rally the group together to determine the identity of the killer despite nobody trusting anyone.

A madman haunted by the ghost of his ex-wife carves a corpse-laden trail.

An elderly heiress is killed by her husband who wants control of her fortunes. What ensues is an all-out murder spree as relatives and friends attempt to reduce the inheritance playing field, complicated by some teenagers who decide to camp out in a dilapidated building on the estate.

Isabella, a young model, is murdered by a mysterious masked figure at a fashion house in Rome. When her diary, which details the house employees' many vices, disappears, the masked killer begins killing off all the models in and around the house to find it.

Three tales of supernatural horror include a woman plagued by threatening phone calls, a family targeted by vampiric monsters, and a deceased medium who wreaks havoc upon the living.

Nora is a young tourist traveling through Rome which takes a sudden turn when she witnesses a murder by a serial killer that the police have sought for years for the so-called Alphabet Killings, and Nora soon finds herself in way-over-her-head trouble when the police want her cooperation to catch the killer while the mystery killer soon targets her for his next victim.

A vengeful witch, Asa Vajda, and her fiendish servant, Igor Jauvitch, return from the grave and begin a bloody campaign to possess the body of the witch's beautiful look-alike descendant: Katia. Only a handsome doctor with the help of family members stand in her way.