Scared to Death

Scared to Death from 1947 is Bela Lugosi’s only color film. From Wikipedia:

The film opens with the disclosure by morgue examiners that a beautiful woman has literally died of fright. The plot reveals how she reached the fatal stage of terror.

The woman is married to the son of a doctor, the proprietor of a private sanatorium, where she is under unwilling treatment. Both the son and the doctor indicate they want the marriage dissolved. Arriving at the scene is a mysterious personage identified as the doctor's cousin who formerly was a stage magician in Europe. He is accompanied by a threatening dwarf.

There are Nazis involved, too. the movie was based on a one-act play, which was based on a 1933 murder case.