The film tells the story of a group of evil gangs in Puguang City who are involved in many cases, including drug trafficking, smuggling, injuring people and grabbing land. The gang members are everywhere, making the whole city a mess. The Puguang City Police have been collecting evidence of the criminal team for many years to protect the safety of the people. The gang is large in number and uses the Internet to commit crimes. The identity of the gang leader is mysterious. It is a high-IQ gang. Every time they are arrested for committing a crime, their gang members always put the blame on themselves, or the witnesses overturn their confessions in court or disappear from the world. They will never involve the backbone members of the gang, so every crackdown cannot wipe them out in one fell swoop. One day, a brave girl changed everything. The victim, Yonglin, walked into the anti-gang brigade of the Public Security Bureau to report the criminal gang. After receiving the report, Tang Fei, the captain of the Puguang City Anti-gang Brigade, led the police officers to conduct in-depth investigation, evidence collection, evidence presentation and arrest operations. They used the golden 72 hours after Yonglin's departure to launch a one-time purge of the gang involved in gangs, find out the core members who control the gang, and let Puguang City return to the city of light.