香港的黑恶势力团伙“洪乐”在选举龙头前夕，“洪乐”龙头候选人之一的李竟（李天翔 饰演）被绑匪绑架，要挟李竟的妻子张菲（何佩瑜 饰演）拿出一千万来赎回她的老公。张菲向警察寻求帮助，而警局负责此案件的正是曾经卧底于李竟手下的探员林祥（邓健泓 饰演），龙头之争，江湖混战,一触即发......

　On the eve of the election of the leader of Hong Kong's evil gang "Hong Le", Li Jing (played by Li Tianxiang), one of the leading candidates of "Hong Le", was kidnapped by the kidnappers, and threatened his wife Zhang Fei (played by He Peiyu) for 10 million. To redeem her husband. Zhang Fei asked the police for help, and the police station responsible for the case was the detective Lin Xiang (played by Deng Jianhong) who was undercover by Li Jing.