Nun Belen works as a spiritual guide in a women's prison. Is a very understanding woman, possibly due to her past. At the past she was Magda, the star of the cabaret "The Mill of Twenty." She was attractive, young and admired by the public, she had it all, but three very different men end up marking her destination. A fate that is inexorably opposed to her happiness.

In a sector of Madrid inhabited by families of a well-off class, a gang of boys and girls has continuous fun, sleep and drink, while their parents ignore practically everything. However, each of these young people has, to a greater or lesser degree, a problem. The parties and parties enjoyed by a group of young people from the upper class are the basis of the story that explains this film. Among them we find the famous couple, once happy, formed by Carlos Larrañaga and María Luisa Merlo. Directed by Fernando Palacios, and with a script by Rafael J. Salvia and Pedro Masó, " It's always Sunday " has no greater intention than entertainment, despite giving history a certain sociological touch, for that of valuing the behavior of the Youth of the time.

Manuel, a young man of eighteen, arrives in Madrid with the illusion of being a bullfighter. On arrival he meets Juan a ruined singer in his fifties who, along with his friend Lola, will help the boy to get a chance to bullfight in a probe at the estate of a famous businessman.

One by one, the Urdaz family is plagued by a series of mysterious disappearances, starting with the tyrannical father that everyone fears.

A scepter is stolen, and it's hunted for by various groups of international robbers and spies, for various reasons - in a parody of 007 movies.

The lawyer Angela Goñi is working in two cases at once: an man that wants to take to Pilo, a young orphan, tp a protection child school. And Mili, another young woman neglected by his father, a businessman, whose aunt Teresa wants to claim through the courts. Taking advantage of the amazing similarity between the girls, the lawyer makes many things to try to resolve the situation as happy as possible.

Paco is the boy buttons a luxury hotel. Usually do small businesses with the resale of tickets to bullfights tourists. By a misunderstanding is fired from his job. There is no use of his taste and wanders the Victoria Street taverns. Finally discovers his only chance in bulls, easy craft that believes and loves. The reality is very different and has to accept the truth which manifests itself in a very dramatic.