Corey Yuen, who put the punch into Jet Li action flicks as the fight choreographer, takes a swing at directing with this slam-bang revenge saga. Qi Shu and Zhao Wei pack a wallop as sisters who turn assassins to avenge the murder of their father, an inventor who developed a high-tech global satellite linkup. Karen Mok costars as a tough cop on their trail and also sings the theme song.