The play is based on the Chinese criminal police code-named 803, and tells the classic cases they solved, vividly shaping the image of front-line criminal police. In the play, in the era of rapid modernization, young and middle-aged police officers such as Lei Zhenting, Situ Min, Wu Tiankuo, and Li Xinchang solved crimes one after another, cracked down on crimes, uncovered economic fraud, hunted down criminals thousands of miles away, and chased fugitives online. Through the battle of wits and courage with criminals, they eliminated violence and protected the good, maintained the peace of the people, and defended the dignity of the law.