Spanish photographer Francesc Boix, imprisoned in the Mauthausen-Gusen concentration camp, works in the SS Photographic Service. Between 1943 and 1945, he hides, with the help of other prisoners, thousands of negatives, with the purpose of showing the freed world the atrocities committed by the Nazis, exhaustively documented. He will be a key witness during the Nuremberg Trials.

Rosario, an octogenarian woman, lives with her son Antonio in a tense relationship. After an argument on the eve of San Juan, Antonio leaves home. When midnight arrives and Antonio does not return, Rosario, driven by guilt, decides to embark on a journey in search of him that will completely change her reality.

Victor is a model child, while Sid is the complete opposite: a rebellious child. Victor wants to help Sid become a proper child. But perhaps nothing is what it seems...