Vitoria-Gasteiz, Basque Country, Spain, 2019. Two corpses appear in the crypt of the Old Cathedral. Police officer Unai López de Ayala, an expert in criminal profiling, must hunt down the ritual murderer who has been terrorizing the city for two decades.

When Ana married Felix, the leader of a rock band and son of a travel agent, she thought her life would be plenty of excitement and travels. Now, in her forties, she leads a monotonous life with her husband and her daughter, giving cooking lessons and taking French courses. But one day she receives an invitation to give a cooking course in Paris.

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.

When her son's alleged kidnapper is released for lack of solid evidence, a reputable and well-known attorney takes matters into her own hands with unintended and spectacularly disastrous consequences.