In 1916, while Europe was in the middle of First World War and Spain was enjoying the advantages of being a neutral country, eroticism was called voluptuousness and Senator Duke of Daroca, despite his ancient lineage, fell completely in love with a famous cabaret singer, Rosario "La Criollita", which was a scandal. At that time, it was doubted that decent women had legs - But this mystery was resolved a decade later, when the roaring twenties arrived and, with them, the sensual Lupe Cardoso

The frog test confirms Julita is pregnant. This is usually a great news. In this case, no. She is a victim of premarital sex, and he, Paco, a mechanic who, according to some theories of French biologist, explained by a podiatrist friend, will not be liable. Don Ramiro, the father of Julia, is a liberal-minded man, but when his daughter tells him that she will have a son who will not parent, seeking the solution of fatherhood in his gun regulation.

Henry is sent by his Aunt Nati to Madrid to begin practice as a doctor because seven years ago he finished his studies and has not yet worked. When he arrived, away from obey her aunt, decides to live together with his friend Mateo, a professional private detective. His first appearance as a doctor is to extend the death certificate of the husband of a beautiful woman that he meets on the road. The next day he sees, in a night club, the widow accompanied of the deceased. On being informed that the man is the administrator of the deceased, decides to solve the mystery with the help of his friend Matthew

Cayetana, her boyfriend Paco and Venancio, her foster brother, commit small thefts and, from time to time, spend a few days in jail. Until they meet with Federico, a thief who has traveled abroad and convince them that using European methods success is guaranteed. Paco then decides to act scientifically and seizes a hospital surgical equipment. When they want to realize, poor Venancio is forced to give an injection to a dentistry patient and, even worse, Paco has to pull out a tooth. And all that, before entering the operating room