魔警 (That Demon Within) (Blu-ray release 2014-6-11) is completely fictional, even though it is inspired by a real Hong Kong policeman who murdered his colleagues. In this movie, we see the psychological struggle of the protagonist, who wants to be a good policeman, but heavily affected by his childhood trauma. The action scenes, although there are not too many, are very good for a Hong Kong movie. The plot convinces me that morticians are ideally suited to hide corpses after murdering people. Overall I think this is a fairly entertaining movie.