This movie is about the story of the people who keep on fighting after the Spanish Civil War is officially finished. They are republicans who take shelter among the mountains (principally the mountains in the north of Spain, between Asturias and León). These people are called "maquis" and defend the thought of a Spain free of the implacable fascism of the illicit military government of General Franco, who took the power in a bloody cruel civil war. Ramiro, Santiago and Gildo are the three main characters of the movie. Santiago and Gildo get killed and eventually Ramiro decides to escape to France, bored of being isolated by the democratic governments of other countries in Europe that kept General Franco in despite of the Republican Government, elected by the Spanish people and not by the power of guns.

This movie explains a not well known part of the recent history of Spain and it is based on a novel by Julio Llamazares with the same title: "Luna de lobos", that means "Moon of wolves".