Barcelona, Spain. A young man is murdered in the middle of the street in front of the police headquarters. Miguel and Marcial, two agents of the Criminal Brigade in charge of the investigation, find in the victim's room a newspaper where a cryptic classified ad appears.

Eugenio Jalon is a young confident and of good character who has never left her village, Segovia, and thinks that life is wonderful.

Cimera de los Infantes, Castile, Spain. The young men who meet every day in the bar La Rana Verde are bored because they barely have fun, so they decide to seduce the girls who attend a summer course in the historic castle of the town.

A history professor is married with a beautiful woman but she is intellectually not able to follow her husband. Therefore she seeks her own pleasures and amusements without him.

Octavio falls in love with a married woman, the Countess of Trevia, who is on the brink of ruin...

A newly remarried widow is accused of having murdered her first husband, who died from arsenical poisoning. Being her present husband a lawyer he takes charge of her defense.