Brainwashed by his masters to feel no pain, Tsui (Jet Li) is a member of China's elite 701 Squad - a merciless team of assassins. But Tsui wants out. Escaping to Hong Kong, he creates a new identity for himself and attempts to lead a normal life. When the city is rocked by a series of gangland murders, each hit bears all the hallmarks of the 701 Squad assassination. Their master plan is global domination of the drugs trade and, as their killing spree takes it's mounting toll, the local cops grow ever more powerless to stop them. Tsui realises only he can end the Squad's reign of terror. Determined to protect his anonymity he becomes 'Black Mask' - a crime fighting creature of the night - and unleashes a one-man war against the most formidable fighting force on earth.