A series of seemingly unprovoked and bizarre suicides occur, the victims uttering "The Green Monkey" before offing themselves. A young hypnotist teams up with a world-weary policeman to unravel the mystery.
Meanwhile a young woman believes she may be next and begs a TV hypnotist to help her - he agrees, but proceeds to exploit her on his programme.
Just when you think you've nailed down the plot it slithers away from you again. The twists and turns keep you on your toes, and as with many of these sorts of films you never know who to trust.
If you're already a fan of Asian cinema, this is one you should add to your collection. It has shades of 'Ring' about it, but is really a completely different sort of film.
If you've only ever seen the sort of product churned out by Hollywood - change your ways! This is as good a place to start as any.