A cryptic suicide note propels Inspector Amaia Salazar back into the heart of the Baztan valley to confront a killer's final, chilling message. A year after arresting Jason Medina for a brutal crime, Inspector Amaia Salazar is called to his trial, only for him to commit suicide and leave her a single, mysterious word: 'Tarttalo'. This reference to Basque mythology forces Amaia to return to her ancestral home, a place of deep personal vulnerability, to unravel the killer's intent. As the investigation delves into the dark corners of local folklore and Amaia's own past, the danger escalates, threatening those she holds dearest.

This novel, the second in the Baztan trilogy, has been recognized for its atmospheric storytelling and compelling detective protagonist. Critics have noted its intricate plotting, weaving together elements of crime investigation with local folklore and mythology. The series has achieved significant popularity across Europe, praised for its suspenseful narrative and the depth of its central character, Inspector Amaia Salazar. Readers often highlight the immersive setting of the Baztan valley and the way the author grounds the mystery in rich cultural traditions.