Der zweite Mann
Starring Max Riemelt, Anna Drijver, Richard Sammel, Fabian Busch, Franziska Weisz, Thorsten Merten, Hildegard Schroedter, Renate Serwotke
It's a thriller and mystery movie, and has a rating of 6.4 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.