Details the workings of a mysterious assassination organization, (codenamed: Naked Weapon), led by its globally feared and master assassin, Fiona Birch. It essays the modus operandi of Fiona where she assassinates a crime mob boss and his mooks. A trained assassin, she violently breaks the spine of a fat mob boss using the infamous Deadly Spine Rip technique.Soon a police detective who has been searching for Charlene for ever since she disappeared but soon an mysterious figure who has a personal vendetta with Madam M and her syndicate appears and both Charlene and Katherine must use the skills they have learnt to defend themselves.This movie began it’s life as a follow up to Wong Jing’s cult classic Naked Killer but as with most of Jing’s projects, the finished product is different to what was originally conceived.