This film, based on the true story of British serial killer Dennis Nilsen, is dark, sordid and creepily unpleasant - exactly as it should be, considering the subject matter.
Nilsen, called "Jordan March" in the film, is played to perfection by Bob Flag, who manages to portray the killer's loneliness and increasing desperation as well as show the other side of Nilsen - the man who holds down a responsible job in the civil service, the man who shows a kindly concern towards the welfare of his elderly neighbour, and all the while who returns each day to his squalid attic flat, complete with resident corpse(s).
The camera work is stark, using harsh lighting and shadows and give the effect (I suspect intentionally) of being filmed by an amateur using an old cam-corder. This only adds to the seediness of Nilsen's surroundings; the shabby flat, the worn carpet that must be peeled back to allow him to lift the floorboards under which to conceal his newest corpse, the sagging bed into which Nilsen brings his latest lover (alive or dead). The whole effect is very disturbing and portrays very realistically how Nilsen spent his desperate and depraved existence.
The murder scenes and their aftermath are very graphic, and the film does not try to play down the horrors of strangulation, necrophilia and dissection and why should it? Anyone watching a film based on the life of Nilsen would not expect it to be easy or pleasant viewing. Nonetheless, you cannot turn yourself away from the sordidness and the horror, while still feeling a tiny bit sorry for the guy; he is not a monster, so how could he have done such monstrous things?
A riveting must for die-hard true crime fans, but those with a nervous disposition will find this film very hard to watch.