After finding a very precious and huge diamond, the famous geologist Hutton mysteriously disappears. The discovery of this jewel sparked a battle between the international underworld.

Professor James Anders is a seemingly mild-mannered teacher, an American working in Rio De Janeiro. Anders, bored with years of teaching, decides to put together a team to pull off a diamond heist during the Rio Carnival. Four international experts are brought together to carry out the robbery: a safe cracking expert, a master thief, a mechanical genius, and a playboy.

After professional stickup man Mario Corda is jailed, his young, ambitious partner -- who covets both Corda's life and his wife -- cuts loose, leaving a trail of dead bodies in his wake.

Rod Cooper, an American agent of the CIA, is sent to Paris to discover if colonel Segura, head of a clandestine organization which proclaims itself anti-Castroist, is playing a double game at the expense of the United States. He first tries to make contact with Ms Beckett, who should tell him. Segura's intentíons, but the woman is found killed. Subsequently, Rogerson, another American, presents Cooper to Segura himself and so Rod can enter his organization. Here he discovers that the colonel tries to attract a certain number of Americans to use them in an attack against the president of a state of southern America and thus promote communist expansion. Segura soon discovers Rod's real identity and tries to get rid of him; but the agent manages to reverse the situation and kills Segura in a shoot-out.

The young architect Guido maintains a relationship with Carla, wife of industrialist Veraldi that despite being aware of her infidelity does nothing to prevent it.

A dangerous criminal group wants to destroy St. Peter's Basilica and the secret agent James Tont is the only one who can help it.

A love triangle develops between three people who run a high tech chicken farm. It involves Anna (who owns the farm), her husband Marco (who kills prostitutes in his spare time) and Gabriella (the very beautiful secretary). Marco continues to kill as jealousy becomes more prevalent on the farm.

An English pianist living in Rome witnesses the brutal murder of his psychic neighbor. With the help of a tenacious young reporter, he tries to discover the killer using very unconventional methods. The two are soon drawn into a shocking web of dementia and violence.

In an isolated villa, Davide Lugani lives with his wife, Carlo, his brother, and their secretary Paolo. Wheelchair-bound Carlo is blind and mute, but his abnormal sensitivity allows him to predict events before they happen. Davide dies of a suspected heart attack and Carlo's nurse is shot dead. The police suspect Davide's widow as well as Paolo, who seems to be her lover. Just as the pair are about to be arrested, there is a twist...

A Scientist that developed a formula to increase the world's food supply, is captured by enemies that don't want this to happen. George Collins, Agent X 1-7 is assigned to rescue him from a castle where he is held hostage.