A swordsman known as The Twin Blades Of Doom kills an opponent in a duel, and filled with remorse he decides to hang up his sword and live a quiet, peaceful life. When he gets caught up in an assassination attempt and reveals his formidable skills he becomes a target for the vicious Ghost Gang, and is dragged back into the martial world and a life of killing.
Twin Blades Of Doom seems to have been the first, last and only wuxia by director Doe Chin, who made a lot of comedies, melodramas and the odd musical. He left part way through production due to cancer that would claim his life soon after, and the film was apparently finished by Yueh Feng.
Perhaps this explains why the film seems to be missing some depth. The characters are quite interesting and you can see the shape of an intriguing story, but it isn't fleshed out all that much.
There is plenty of action though, with fights breaking out seemingly every few minutes. The action is pretty good, well-filmed and surprisingly bloody, though it does suffer a bit from "invincible hero" syndrome - Ling Yun's character outclasses his opponents to such a degree that the stakes start to feel a bit low as he easily murders his way through hoardes of enemies.
The fact that he obviously relishes this is what makes his character interesting - he has tried to put violence behind him but once he is forced to kill again it comes back to him very easily.
The result is a generally solid wuxia that looks really good, but is ultimately a bit shallow and lacks a major selling point to distinguish it from its many contemporaries.