Linjin is a small coastal town, and a series of mysterious cases occurred in this small town. Interpol captain Xue Qiang led Sun Jiajia, Li Qiang, Wang Hui and others to clear away the fog and finally captured the murderer hidden in the crowd. In the process of solving the case, Xue Qiang demonstrated his integrity and bravery, and also demonstrated his strong reasoning and case-solving abilities. Sun Jiajia has both the soft side of a woman and the sensitive sense of smell of a police officer. She is Xue Qiang's good assistant. He showed his talents in solving crimes and gained growth. Li Qiang and Wang Hui are also upright and brave young policemen. Through their joint efforts, they cracked the Gray Shadow, the largest underworld organization in Linjin. They also gained their own growth and strengthened their beliefs, and also brought security and stability to the small town of Linjin.
