Crouching tiger, hidden dragon

the long version

"Seventeen years after the legendary fighter Mubai dies protecting the world-conquering sword The Green Destiny, four great warriors are called together to guard the formidable weapon once more. The forces surrounding the sword irrevocably altered the life of Shulien, Mubai's lover, but seventeen years later she is still honor-bound to defend the blade from the power-hungry warlord Hades Dai. The young fighters Wei-fang and Snow Vase, switched at birth, also have heritages and inheritances that inextricably link them to both each other and the fate of the sword. And Silent Wolf, Shulien's former fiance, returns from presumed death to thwart Hades Dai-- and rekindle an emotionally isolated Shulien's feelings."--