The series takes a vicious crime as its starting point and tells, from the perspective of young criminal police officer Chang Zheng, the heroic story of two generations of public security officers who risk everything and carry on the fight to safeguard peace in their community and wipe out criminal gangs. In the small city of Changwu, on the front line of a battle fraught with danger, Chang Zheng, deputy head of the criminal investigation squad, is drawn into a maze of intrigue because of his long-running investigation into the powerful Zhao Xiaosheng family.
