A young postman becomes entangled in a dangerous criminal underworld after accidentally acquiring a recording of a famous opera singer. Jules, a Parisian mail carrier, attempts to navigate the consequences of his obsession with the elusive diva Cynthia Hawkins. He faces pursuit from rival criminal factions and corrupt police officers who seek the illicit tape he possesses. The narrative utilizes a lean, fast-paced style to depict the gritty underbelly of Paris, focusing on the tension between the protagonist's romantic idealism and the harsh reality of his situation.

Readers frequently highlight the book's distinctively cool, detached tone that defines the French noir genre. Discussion often centers on the contrast between the protagonist's naive romanticism and the cynical, violent world he inhabits. Critics often note the efficiency of the prose, which avoids unnecessary ornamentation to maintain a brisk pace. Many readers appreciate how the author uses the opera singer as a symbolic anchor for the story's themes of beauty and corruption. The work is widely recognized for its influence on the stylistic evolution of modern crime fiction.