Lavish historical action film telling the story of a trio of warriors in the era of the Qing Dynasty - General Ma Xinyi (Jet Li), Cao Er-Hu (Andy Lau) and Zhang Wen-Xiang (Takeshi Kaneshiro) - who make a pact of brotherhood to one another vowing that anyone who harms one of the brothers will be killed. When the country is plunged into chaos and political upheaval following the Taiping Rebellion, the three blood brothers must struggle to maintain their loyalty as war rages around them.

Having been blind since the age of two, twenty-year-old Mun decides to undergo a risky corneal transplant operation. When the bandages come off, the operation seems to have been successful, but Mun begins to experience unnerving visions of mysterious strangers and it soon transpires that the face she is seeing in the mirror is not her own. Desperate to escape from this nightmare, Mun sets out to discover the identity of the person through whose eyes she is now viewing the world.