During the self-defense counterattack against Vietnam, Zhao Da Sheng, the commander of the reconnaissance company, lost his memory due to injuries and was saved by fraternal troops. Zhao Da Sheng's comrade-in-arms Yu Zhong Jun, thought that he had died, and according to their previous promise, he took good care of Zhao Da Sheng's wife Wang Yu Lan and son Zhao Xiao Jun, and the three formed a new family. A few years later, Zhao Da Sheng, who recovered his memory, returned to his hometown, only to find that his wife had remarried a friend.
But he doesn't have much time , to deal with his personal issues - soon, he's ordered to lead a joint investigation team to investigate the Yangpu Port hazardous chemical explosion case. And as a member of Dongjiang City Discipline Inspection Commission, Da Sheng, takes the issue very seriously. Soon, Da Sheng, who is now investigating, discovers that the city is full of connections between politics and the military, and everything is not made easier by the fact that his former companion becomes the mayor of the city.
Three veteran cops who once dominated the police force have to come up with innovative methods to deal with a new kind of crime.
Known at the trident, Cui Tiejun (Chen Jianbin), Xu Guozhu (Dong Yong) and Pan Honghai (Hao Ping) who have all retreated to the second line of defence suddenly come upon a complex money laundering scheme. They face off with an opponent from 20 years ago and various forces seeking to take advantage.
Crime has found new means of hacking to obtain large sums of money. The trident employs the best weapons at their disposal as they resort to old school sleuthing skills in an attempt to bring down the crime syndicate in one fell swoop.
