Ringo Lam"s first Hong Kong film after his try in Hollywood is an impressive one.The plot itself has so many unexpected twists that you can watch it easily twice and still discover things you didn't see the first time.The good camerawork gives the movies atmosphere of tension,fear and the supernatural an extra boost.The cast has proven itself already in several other Hong Kong films and also here they deliver an excellent performance.This movie is a good start if you're not into Hong Kong films but want to give it a try,for the real fans it's a must see!