In Paradise City, a series of bizarre and absurdly humorous mysteries continue to occur. Detective Luo Mingxiao, female detective Fei Xueqi, technical geek Gu Xiaoda, and informant Douzi Ge formed a temporary "Laughing Detective Bureau" to work together to solve ridiculous cases. Behind every mystery lies a greater dark force. 'Think twice about alliance'. The protagonist team gradually develops friendship in the battle of wits and courage, and finally reveals the true identity of the city shadow and the mastermind Zhao Sansi. The book combines compact and high-energy reasoning with witty humor, sharply reveals the various aspects of human nature, and creates a relaxing, joyful and meaningful journey of solving puzzles.