When a woman dies under strange circumstances in a Toledo park in the sixties, her intriguing last words mention Juanelo, Italian Renaissance scientist and inventor in the wake of Leonardo da Vinci who served Charles I, Philip II, and left his imprint on the imperial city. Twenty years later, in New York, the protagonist receives an enigmatic message inscribed in the frame of a forged painting by El Greco that prompts him to return to Spain and embark on the investigation of the ill-fated fate that many friends and friends have suffered during his absence. acquaintances who had in common their interest in the sage whose memory and knowledge someone was careful to erase ...