In Hong Kong, a weapon dealer has a special computer chip, which is needed to build a secret missile. He is trying to sell it to a foreign goverment. The local secret police, the CIA and an enemy band is looking for him, but he has a very rich and influential man as his partner.

An expert assassin - trained since childhood to be the perfect killer - loses her memory during a mission in Thailand, and ends up in the care of a wry ex-policewoman and her boxing cohort. The equally lethal sister of the assassin pursues her, uncertain of her intentions and whether to kill her.