The novel explores the life of a Spanish expatriate in England who is recruited by a secretive organization due to his unique ability to interpret people's behavior. As he becomes entangled in a world of espionage, he grapples with moral and ethical dilemmas, questioning the validity of his work and the consequences of his actions. Through a blend of introspective musings and suspenseful narrative, the protagonist's life unravels, revealing a complex web of deceit, betrayal, and violence.