Leandro, an unemployed mason and his friend, Tocho, attempt to rob a tobacconist in the Vallecas district of Madrid, but Mrs. Justa, the tobacconist, impedes it alerting the neighbors who notify police. Inside the shop, the confrontation between the two friends and their 'hostages', the tobacconist and her niece Angeles, is relaxing, and a budding sympathy arises between them.

Rodrigo Díaz de Vivar, “Mio Cid”, is in love with Jimena, but the Count of Oviedo, his father, challenges him to a duel and is killed. He before him curses Rodrigo, that if he marries Jimena, he will lose his manly faculties. And, in fact, when he gets married, Rodrigo becomes effeminate.

In Madrid of the 20's, many women were hired as wet nurses for middle class families. Milk is paid very well, so women are turning to the honest services of Paco, glazier by trade, which completes his monthly salary getting pregnant the clients who pay for it.

Marisol, who has recently lost his father at sea, leaving Cadiz to go live with his uncle Ramon. He lives in a family that falls apart because of his wife Eleanor, obsessed only pretend to their friends, who spoiled her children, Javier, Churri, Jorge and Pili. Javier is dedicated to waste money. Churri flirts with several suitors, and end up choosing the least of it is. Jorge lose too much time exercising and neglected studies, and Pili, even a child, she spends hours without leaving the cinema. Javier gets into financial problems that threaten to take him to jail, and Marisol decides to get the money anyway. Furthermore, it decides, with the help of the maid of the house, Herminia, and a friend he met on the train, trying to straighten out the family, earning the enmity of immediate Leonor, who from the beginning did not look favorably upon the arrival of the child.

Juan and Carmen are a humble couple living in Madrid. She does the housework and he works as an electrician in a film studio. Their dreams of wellness come true when they win a contest sponsored by a soap brand.