The public security system has laid a grand surveillance system like a dragnet - the "Skynet" project. Under the leadership of Director Du, the public security criminal police have written their own unique style: the selfless Yan Li, the enthusiastic and intelligent Xia Fan, the deep and wise Xu Lei, the humorous Zhou Wei, with their firm belief, they have unraveled one confusing and suspenseful case after another - the revenge hand reaching out to the son of the criminal police captain, the murder and framing of the plan, the car explosion and love murder case where the suspect is not present, the theft of the national treasure Doucai Chicken Cup, the robbery of the bank armored car, etc. In the escape and pursuit, the blood and the gunshots, the criminal police fought wits and courage with the criminals, holding up the balance of justice that never tilts. At the same time, their emotional life is also full of ups and downs: Yan Li's marriage crisis, Zhou Weihe's secret marriage storm, Xia Fan's deep affection for Xu Lei, Xu Lei's escape, and the secrets buried for many years in his autistic daughter Jingjing. When all the truth comes to light, we will know that no matter how rampant the criminals are, there are always brave detectives watching in the center of Skynet, upholding justice and protecting one side.