SWAT sniper Song Nian, alongside her teammates, engages in a fierce battle with the robbers of a diamond transport vehicle. SWAT team captain Han Songlei is severely injured while protecting his team. Turning her grief into strength, Song Nian embarks on a battle of wits and courage against the robber's gunman, Su Xue, and the corrupt businessman, Zhang Maolun. In the end, she uncovers the conspiracy behind the diamond heist and brings the criminals to justice.