Backpack

In Jiangnan Township in 1981, a cashier was murdered while carrying workers' wages. Only half a mutilated shoe print and half a cigarette butt with saliva were left at the scene, which became the only anchor point for young detective Li Shanling in his 45-year pursuit of the murderer. From the era of manpower investigation in which half of China was carried out on foot with canvas bags, to the transformation of information-based criminal investigation where fingerprints and DNA databases are networked, to the era of digital intelligence solving crimes in which AI big data locates suspects in seconds, the "backpacks" of the three generations of criminal police officers have changed one after another: from coarse cloth bags filled with dry food and handwritten files, to nylon bags containing portable investigation equipment, and finally upgraded to "digital backpacks" that integrate national data resources. However, the promise of "not withdrawing troops until the case is solved" has never changed. This long criminal investigation novel is rooted in the true development history of Chinese criminal investigation. It uses a murder case spanning 45 years as a context to connect the complete transformation of China's public security criminal investigation system from 1981 to the present from manual filing to digital intelligence empowerment. It writes about the "backpack spirit" passed down from generation to generation and explains the Chinese criminal police's unwavering persistence in justice. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.