In order to rescue his brother Vulture, Hummingbird sneaks back into the country, swiftly gathering Vulture's old troops to organize a terrorist operation against the police. Instead of backing down when faced with Hummingbird’s threat, the SWAT police cleverly strategize by exploiting the opponent’s character weaknesses. New-generation SWAT police officers such as Mei Jing and Liang Zhuang, and middle-aged police officers such as Director Gao and Mei Xiaodong, work closely together during the operation to eventually uproot the vicious criminal group.