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.

Set in Victorian London, the narrative revolves around a cunning antihero who leads a group of beggars and is involved in various criminal activities. He marries the daughter of the king of the beggars, only to be betrayed by his new wife and a former lover, which leads to his arrest. As he faces execution, a deus ex machina twist saves him at the last moment, allowing him to return to his life of crime. The work is a biting satire of capitalist society, showcasing the corruption and moral ambiguity that pervade all levels of society, from the lowly beggar to the esteemed official, all underscored by memorable music that adds a layer of irony to the darkly comedic plot.