Il diavolo nel cervello

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.

An American writer living in Rome witnesses an attempted murder that is connected to an ongoing killing spree in the city, and conducts his own investigation despite himself and his girlfriend being targeted by the killer.

A San Francisco doctor encounters a prostitute who bears a striking resemblance to his late wife.

A reporter and a blind, retired journalist try to solve a series of murders. The crimes are connected to experiments by a pharmaceutical company in secret research. The two end up becoming targets of the killer.

A wealthy playboy gathers a group of bourgeois friends at his isolated beach house for a weekend of relaxation. When bodies start pilling up, they realize they’re trapped with a killer in their midst, sending them in a frenzy to figure out who amongst them is killing the others before they are killed next.

As a thirteen year old, Martha Caldwell witnessed the death of her parents in a terrible railway accident. Barely surviving the tragedy herself, Martha was struck dumb due to the shock. Now an adult, the still mute Martha lives with her uncle Ralph in the Spanish countryside. Martha's cousing Jenny arrives to be with the family but is quickly stabbed to death. It appears that a sex maniac is roaming the countryside; killing pretty young girls. The already traumatized Martha seems likely to be the next victim but the case turns out to be far more complicated than it would first seem.

After her husband dies in a freak plane accident, a woman leaves London for Athens to collect his generous life insurance policy. She soon discovers that others besides herself are keen to get their hands on the money - and are willing to kill for it. Meanwhile, a private investigator arrives to investigate irregularities in the claim, teaming up with a beautiful reporter.

After several Catholic school pupils are murdered, a teacher 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.

After a French prostitute is found dead, one of her regular clients is tried and convicted for her murder. He is eventually sentenced to death but dies in a high speed pursuit after attempting to escape custody. Soon, the witnesses that testified against him end up being systematically murdered by a mysterious killer wearing black gloves.

An American journalist in Prague searches for his girlfriend who has suddenly disappeared.

Nicola, a cop, spies on his wife Sarah buying sexy black panties and realises that she is having an affair. Following a violent confrontation, he leaves her. Immediately after, whilst taking a shower, Sarah is stabbed to death with an icepick. Believing it to be an simple crime of passion, the police assign Inspector Pierro Terzi to bring his former colleague in. But Professor Anna Berardi, a criminal pyschologist who is friends with both men, believes the Nicola is innocent. She suggests that the real killer is Franco Tribbo, a maniac known as "The Midnight Killer" who supposedly died in a hospital fire several years previously. Terzi is not conviced but Nicola is killed and the murders continue...