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.

Summer of 1976. Bea is 16 years old and she collaborates with a group of women to make visible the feminist cause and achieve the approval of the right to abortion. The rebellion she feels in the blood will mix with an unexpected feeling that will disrupt her the inner world. Throughout these months, Bea will engage in a very special friendship with Miren, older than her. Her political commitment and her relationship with Miren will turn that summer into a stage that will mark her life forever.