Foreign agents from an unidentified nation clandestinely install radio and TV antennas in Rio de Janeiro devices that emit subliminal waves that alter the perception of the population. They aim to transform the people into an aggressive and imbecile mass, leading the country to chaos, allowing the government to be taken to usurp Brazil's natural wealth. A journalist, Carlos, accompanied by chemist Laura Leal, begins to investigate a series of facts and discovers those responsible for the disturbances.

Country girl arriving in a big town falls in love with her boss, without knowing who he was.

In a hospital bed, Eduardo, a married man, remembers his involvement with the young Anita, until their downfall.

Two men love the same woman and make a death pact, but fate surprises all three (and the public).

Camillo Mastrocinque was one of many foreigners who came to Brazil in the 1950s to make films. The director of melodramas during the Italian fascist era directed this film, Areião (Inca Film, 1952), which could have spared Maria Della Costa. The film was renamed La priggione di sabbia to compete at the Venice Film Festival, but was rejected.

Nair marries Renato for love, and is unhappy because her husband all the money with his lover, Arlete. Sónia, Nair's friend, is a woman who lives happy with a man out of wedlock. Sónia's example Nair to accept the advances of Jorge, a lawyer who lives separate his wife. During a jealousy fight, Nair kills Renato, and it will be Jorgewho will plead she is not guilty of murder, as she acted in defence, when she was facing her own death...