I really loved this movie. It's from the period of New German Cinema 60's - 70's and highly influenced by the American gangster films such as the noirs. I really enjoy it.

I just finished up taking a New German Cinema class and it was well worth it. People always talk about French and Italian Cinema. The Germans did not let up after German Expressionism.

http://www.imdb.com/title/tt0064588/

My review of it would be inspirational.