A helicopter crashes in the Sahara Desert. The entire crew are killed - only a small infant miraculously survives. Emir Tafud, who has no children of his own, brings the child up as his successor. When Ben is 25 years old he decides to set off in search of his true parents. In Casablanca he meets French crook Jacquot, who takes him with him to Monte Carlo. They both actually manage to find Ben's mother Christine. She tells Ben that his father was a scientist on a secret mission to Africa. Christine wants Ben to stay in Monte Carlo and take over her firm, but Ben has his heart set on living in Belem with his adored Amina. But now Ben gradually unearths a dreadful secret: Christine's second husband François was responsible for the death of his father, who had discovered valuable minerals in the Sahara. After a bitter struggle, Ben finally succeeds in saving his homeland from Western greed.

Peter Goodrich, an English antique dealer visiting Naples for a pleasure trip, meets the beautiful Lisa Carter by chance and begins seeing her until the woman disappears.

Arrived in Naples to work in the Doumenec family's factories, engineer Stefano Mascardi meets Rita, wife of Junio ​​Doumenec, eldest son of the industrialist Alfredo Doumenec, founder of the factory of the same name. A liking is born between the two but, soon, Stefano learns that Rita is involved in shady deals. The woman is in fact the lover of an unscrupulous man, Mr. Detoledo and, in agreement with him, has recently stolen an important industrial formula from Doumenec. When Mr. Detoledo is found killed, Stefano receives a mysterious phone call. A woman arranges to meet him in the very place where Detoledo's body is found by the police. It's a trap? Maybe... But in the meantime, next to Mr.'s body. Detoledo, a photograph portraying three girls is found. One of these is Rita Doumenec..

On a hot summer night, Raffaele, the elderly manager of a Neapolitan counter-lot, is brutally strangled in his own accommodation.