The novel follows the life of Rong Jinzhen, a mathematical genius with a unique mind, who is recruited by a secretive Chinese intelligence agency to crack an enigmatic enemy code. As he delves deeper into the world of espionage and cryptography, Rong becomes increasingly isolated, grappling with the immense pressure and the psychological toll of his work. The story explores themes of intelligence, madness, and the fine line between genius and insanity, set against the backdrop of a shadowy world where secrets are paramount and trust is a rare commodity.