The plot revolves around Jorge and Marta, who together with their two children form a typical middle-class Buenos Aires family in the 70s. One day, physically and mentally tired, she decides, a little reluctantly of Jorge, to go a few days of rest to Mar del Plata. As expected, the temptations of summer on the beach do not take long to appear, since Marta will try to seduce different types of heartthrobs. At the same time, her husband, who has been left in Buenos Aires alone, since the children of the marriage have gone to spend the summer in the fifth of some relatives, is also tempted to live a few days of single. Both, each with their own values, must decide whether or not to give in to their own temptations, but unexpected news will suddenly change the plans of each of them.
Juan Carlos, a businessman, falls in love with a woman much younger than him, and ends up marrying her. Juan Carlos' mother-in-law, following an incident with him, tells him a fabricated story: that the father of her daughter is a stranger, with whom she had sex in the car of a train. Coincidentally, this situation had happened to Juan Carlos many years ago, and now, with the doubts that his wife is his daughter, he does not even want to approach her on his wedding night.
