On a stormy evening at an arms factory near Shanghai, a young female employee is brutally murdered during a game of Russian roulette after being accused of stealing a box of bullets from the merciless Boss Ding (Liu Kai Chi). Two weeks later, a string of mysterious deaths occurs at the factory, with victims being shot but no bullets found at the scene. Whispers of a lethal curse begin to circulate among the workers, instilling fear throughout the factory. To unravel the enigma of the ghostly bullets, the unconventional police inspector Song Donglu (Lau Ching Wan) and his fiery, gun-slinging partner Guo Zhui (Nicholas Tse) are called in to investigate.