Hey I love this one. I've always been a Klaus Kinski fan and he's so particularly demented and soft-spoken from the get-go in this one, that he can't possibly be the good guy. No one with a German accent is.
He plays the Dr. Karl Gunther, son of a Nazi war criminal, who's escaped to America from Argentina and becomes an apartment manager. It also turns out that many of his tenants mysteriously disappear while the building is under his supervision.
It seems the 'good' Doctor can't stop killing them and he sets up his murders by crawling around in the building's heater ducts and observing his victims before making his move. There's also a woman he holds captive in an animal cage up in the attic, who he keeps as company after he's cut out her tongue.
Then innocent Lori Bancroft (Talia Balsam) moves in and Kinski takes a lot of interest in her before going on one final murder spree towards the end.
Also notable for being filmed on the same apartment building set as TROLL (1986), with all the action taking place indoors and in the heater ducts. Don't look for a wide variety of locations here. It's a small film.
Like I said, I enjoyed it and would recommend it mainly for Kinski's performance, but don't expect any extras on the MGM DVD because they're aren't any.
7 out of 10