August 1936, the beginning of the Spanish Civil War. 51 members of the Claretian community of Barbastro (Huesca) are martyred, die for their faith. The film recounts the last weeks of his life, since they are held until they are finally shot. During that time, they perform various writings they talk about their situation, of his fellow captives, people who saw them. These writings have been the basic testimony used to narrate this real fact in film version.

Set during the Spanish Civil War, the powerful drama explores the fight for freedom during the anarchist uprising through the eyes of a young seminarian faced with a choice between love or death. Based on the incredible true story of Esteban Casadevall and his young colleagues as they witness the first salvos against Franco in their hometown, Forbidden God reveals the depth of the human spirit in war, romance, and political upheaval.