The Lady Assassin is a Shaw Brothers film directed by Chin Ku Lu, starring Norman Chu and Jason Pai Piao

Plot

The villainous 4th Prince plots to change a royal edict proclaiming himself as heir to the throne instead of the Emperor's favoured fourteenth prince. The Fourth prince gets the backing of Han loyalists by promising that the Manchu rule of iron will soften when he is in power however he fails to keep his promise and turns against those that helped him.