The plot's there in the title, basically... a fairly typical horror-comedy from 80's HK, i.e. it's not remotely scary. Unfortunately it's not particularly funny either, and the plot is basically a series of skits that relies on people acting completely stupidly & illogically to get from one scene on the next. There are a few scenes that are moderately entertaining - a brief fight scene with Chung Faat is the only bit that I'd call really memorable though.

Back in the day I suspect I'd have enjoyed this film a lot more, but maybe I've just seen too many? I found it watchable, but not something I'd be overly inclined to recommend (or to watch again).