After the execution of the spy Mata-Hari, the secret service takes the opportunity to arrest some of her collaborators. To arrest one of the ringleaders, they use his girlfriend Niní, a naive dancer. The girl, tired of being manipulated by everyone, decides to become agent X25.
Once the Spanish Civil War is over, the sons of the wealthy classes, who support politically and militarily the new regime, are preparing to begin their ascent in the social and economic sphere.
Fortunato is a loser, a family man, who has lost his job and tries his luck in all the trades he finds. However, it seems that his name —that means “fortunate” in English— is not in line with his situation, since, no matter how hard he tries, fortune does not want to smile at him.