Behind the Mask
Starring Michael Redgrave, Tony Britton, Carl Möhner, Niall MacGinnis, Vanessa Redgrave, Ian Bannen, Brenda Bruce, Lionel Jeffries, Miles Malleson, John Welsh
It's a drama movie, and has a rating of 6.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Germany.