Ming Richie Ren is renowned as the top shooter in the police force. But behind the legend lies a skeleton in the closet: his former teammate and superb marksman CHING Xiaoming Huang, who was jailed for accidentally killing a hostage, has just been released. With only vengeance in his mind, Ching determines to take on Ming and the police, believing they are the real culprits for his fall.
When a high-security prisoner transfer is sabotaged by a mysterious sniper and a major convict has escaped, Ming and his team are dispatched to profile the suspect. O Edison Chen, the hot-headed rookie on the team, surprises everyone by accurately replicating the suspect's impossible shots. Ming sees the potential in this youngster and decides to take him under his wing. Yet when O becomes fascinated by Ching and determines to top his shooting skills, he might become another wild card on the loose.
Meanwhile, Ching continues his plan with the largest heist ever in the city. Believing that Ming had withheld key evidence that could free him, Ching decides to lure his target in by holding Ming's daughter as hostage and re-enacting that fateful day. It is the ultimate showdown amongst three expert snipers in the Hong Kong cityscape...