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.

A woman returns home from a mental hospital, to find his husband has used her case to write a play.

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.

A prospective bride and groom have misadventures in Mexico City.

Arsenio Lupin is an audacious Parisian thief who mocks the police, especially Inspector Ganimard, but turns over most of his ill-gotten gains to charity. One night, he attends a party disguised as a newspaper writer who also mocks Ganimard; the next morning, the host's wife and a male guest are found murdered, and Ganimard arrives to solve the crime. A Mexican version of the Arsene Lupin character, with Sherlock Holmes tossed in as a cameo at the end.

A 17th century woman, imprisoned for fighting in a bar, recounts her past to a priest. She tells of her father teaching her how to fence, of being sent to a convent by her aunt when her father died, of escaping by dressing as a man, and of her life as a man following the escape.

In times of the French Intervention, a student of Nunó, author of the Mexican National Anthem, falls in love with the niece of the French Ambassador, which causes quite amusing complications.