

A year has passed since Amaia Salazar solved the crimes that terrorized the Baztán Valley. Pregnant and determined to leave behind what she experienced in Elizondo, the inspector's life is once again disrupted by an unexpected event: the suicide of several prisoners who leave a single word written on their cell walls: Tarttalo. The dangers Amaia thought she had left behind return with more force than ever, and the inspector must confront this new case in a breakneck investigation threatened by the presence of her own mother.