Caught it on Turner Classic Movies last night. Boris Karloff at his best. Bela Lugosi being Bela Lugosi. This movie could easily be modernized and become even creepier. Ignore the typical 30's "Oh, Darling!" acting by the "American honeymooners" and focus on the play between Karloff and Lugosi. Even the setting of east Europe is contemporary - "he built this house on the scene where thousands of men died during the war..." and "many men have gone to (something Slavic) Prison, but very few have come back. I have come back." - could be Kosovo or Sarajevo nowadays.
A driving rain, a dead body, an unconscious damsel, a psychotic doctor, a mad war criminal, a dead telephone, a game of chess where lives hang in the balance, devil worship, secret chambers, a couple of black cats (one of which gets stabbed), a man getting skinned alive, and lots of shadows on the wall. Good stuff for some late night creeping.
