Ding (Liu Kai-chi), the overbearing owner of a bullet factory in Tiancheng County, intimidates his workers to keep them in line, leading to a public Russian roulette "suicide" of a female employee (Xuxu) accused of stealing a box of bullets. A curse relating to a certain "Phantom Bullet" is found written in red on the walls of the factory, though the workers are soon ordered to scrub it off. Subsequent deaths from "phantom bullets" which are never found, seemingly vanishing, suggest that the factory has really been cursed. Song Donglu (Lau Ching-wan), a newly promoted detective with a slightly eccentric personality, is summoned by Tiancheng's police chief Jin (Wu Gang) to assist Guo Zhui (Nicholas Tse), "the fastest gunman in Tiancheng", and novice policeman Xiaowu (Boran Jing) in investigating the peculiar murders.