"The Heretic" is a historical novel set during the Spanish Inquisition. It follows the life of a man born in 16th century Spain, who, despite being raised in a strictly Catholic environment, begins to question the teachings and practices of the Church. As he grows older, he becomes involved in the Protestant Reformation, risking his life in a society where heresy is punishable by death. This book explores themes of faith, religious persecution, and the struggle for freedom of thought.

This gripping novel unfolds in the misty and myth-shrouded Baztan Valley of Navarre, Spain, where a detective returns to her hometown to investigate a series of eerie murders. The victims, teenage girls, are found in a state that suggests ritualistic killings, drawing the detective into a complex web that ties the present crimes to her own troubled past. As she delves deeper, local superstitions and family secrets emerge, challenging her rational beliefs and forcing her to confront the possibility that the answers she seeks might be as intangible as the mythical Basajaun, the invisible guardian of the forest. The story masterfully blends elements of crime, folklore, and psychological thriller, creating a suspenseful narrative that keeps the reader guessing until the very end.