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.

As in the novel of the same title from Camilo Jose Cela, "La Colmena" is a sad composition with the stories of many people in the Madrid of 1942, just the postwar of the spanish civil war. The main theme of the film is the contrast between the poets, surviving close to misery under the Franco's regime, and the winners of the war, the emerging class of the people that makes easy money with illegal business.