A cryptic suicide note referencing Basque mythology forces a detective back to her vulnerable family home to confront a dangerous truth. Detective Inspector Amaia Salazar is on the verge of maternity leave when the trial of a notorious serial killer, Jason Medina, is abruptly halted by his suicide. Medina's final act is a single, enigmatic word – 'Tarttalo' – directed at Amaia, compelling her to return to the Baztan valley, the place of her deepest vulnerabilities. As Amaia delves into the investigation, the lines between her personal life and professional duty blur, placing those she holds dear in grave peril.

This novel is the second installment in Dolores Redondo's acclaimed Baztan trilogy, a series that has garnered significant attention across Europe. It was shortlisted for the CWA International Dagger, highlighting its critical recognition. Readers and critics have praised Redondo's atmospheric storytelling and the compelling character of Inspector Amaia Salazar, often comparing her to other notable European detectives. The narrative is noted for its intricate plotting, blending suspenseful crime investigation with deep dives into local folklore and mythology, creating a rich and immersive reading experience.