I really enjoyed this film and am amazed at its poor reviews and rating on IMDb. I think over time its rating will go up and maybe it will even achieve cult film status, I think it deserves it.
For those wanting a straight horror/mystery film with a final scene that wraps up all the loose story lines then you need to go elsewhere to one of the more predictable Hollywood horror films of the moment. This film is far more reminiscent of the Italian and English horror films of the 1960's and 70's, more about the atmosphere and the visuals than following a coherent story line. The cinematography is glorious and the locations and the sets look stunning. Others have complained about the 'blue' night scenes being amateurish, I think this was the intention of the director, to make it look more stylised than a regular night shot, think Dario Argento's 'Deep Red'.
The acting is fine from unknown actors; Jytte-Merle Böhrnsen is captivating as the Forbidden Girl whilst Klaus Tange plays a wonderful 1960's style baddie with blond Nazi hair.
So if you love the atmospheric horror films of the 1960s and 70's then you'll love this, go on, give it a try.