Night Must Fall
Starring Robert Montgomery, Rosalind Russell, May Whitty, Alan Marshal, Merle Tottenham, Kathleen Harrison, Matthew Boulton, Beryl Mercer, E. E. Clive, Eily Malyon
It's a drama and mystery movie, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Germany.