Vitoria, Basque Country, Spain, March 3, 1976. After several months of protests demanding decent working conditions, a general strike is called. Thousands of workers gather at the church of San Francisco while a hundred heavily armed policemen wait to act.

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.

A man and a pregnant woman are crossing a snowy forest, trying to escape a dark past linked to a traumatic crime, but she is waiting for them, hidden among the trees, determined to stop them.