The story of the making and subsequent success of The Day of the Beast, the Spanish cult film directed by Álex de la Iglesia and released in 1995.

A journey through the work of Spanish filmmaker Juan Piquer Simón (1935-2011).

Russian front, winter 1943. Soldier Arturo Andrade and Sergeant Fernando Espinosa are commissioned to investigate a mysterious murder while the Spanish Blue Division of the German Army endures the fierce counterattack of the Red Army.

Days before committing an attack, Antonio, a gunman of the terrorist gang ETA who has dedicated his life to a cause he no longer believes in, meets Charo, a young drug addict who, despite the sordid environment in which she lives, still retains her innocence.