The Black Room
Starring Boris Karloff, Marian Marsh, Robert Allen, Robert 'Tex' Allen, Thurston Hall, Katherine DeMille, John Buckler, Henry Kolker, Colin Tapley, Torben Meyer
It's a crime and horror movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Germany.