Francesc Boix (Mario Casas) is a prisoner who works in the photographic laboratory of the Mauthausen concentration camp. With the help of a group of Spanish prisoners who lead the clandestine organization, Boix will risk his life to implement a plan: the escape of negatives that will demonstrate to the world the atrocities committed by the Nazis in that concentration camp. Thousands of images that show from within the daily horror of a perverse system. The photographs that Boix and his companions managed to save were decisive in convicting senior Nazi officials at the Nuremberg trials in 1946. Boix was the only Spaniard who attended as a witness.
This historical film based on real events about the photographer Francisco Boix is directed by the Catalan Mar Targarona (Kidnapping, Mor, life meva) and its main cast is made up of the actors Mario Casas (Under the wolf skin), Alain Hernández (Escape plan), Marc Rodríguez (Tasting menu), Joan Negrié (Near your house) and Macarena Gómez (Fur).