Two couples live through attraction, distraction, sympathy, friendship, quarrel, jealousy, fidelity, and the Devil supervises it all by delivering solemn warnings in choice moments.

Portuguese Rock'n'Roll history since the late 50s

António, a factory worker of immense musical talent, is discovered by a business man who launches him as a singer. Nevertheless, this changes the man's life for better and for worst.

Leonel is a pianist, nostalgic of sweet melodies, while his son is the (real-life) leader of Os Gatos Pretos (black cats), a twist musical group. The conflict is eventu ally solved when Leonel's daughter, Cilinha, starts dating Raúl, a well-off young man, who promote a new dancing club, the Lisboa Antiga e Moderna, where old new music get even shares.

During a tour of the province, someone mistakenly leaves a baby in a singer's car without him noticing. António decides to take the child in, with Madalena, a fellow artist. But the presumed mother, claiming it was a mistake, enlists the help of her brother, a police officer, which leads to a chase to Porto.