(2016) – Known as his most psychological work, it dives deeper into the internal struggles of the investigators.
The "piece" you are likely looking for refers to the second trilogy written by the Spanish crime novelist , titled "Refranes, canciones y rastros de sangre" (Proverbs, Songs, and Traces of Blood).
This trilogy continues the "Gellidista" universe, following his first trilogy, Versos, canciones y trocitos de carne . It follows the character Ramiro Sancho as he returns to duty in Valladolid to investigate complex and psychological crimes. Books in the Trilogy