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The Blue Angel is a 1930 German musical comedy-drama film directed by Josef von Sternberg and starring Marlene Dietrich, Emil Jannings and Kurt Gerron. Written by Carl Zuckmayer, Karl Vollmöller and Robert Liebmann, with uncredited contributions by Sternberg, it is based on Heinrich Mann's 1905 novel Professor Unrat and set in an unspecified northern German port city. The Blue Angel presents the tragic transformation of a respectable professor into a cabaret clown and his descent into madness. The film was the first feature-length German sound film and brought Dietrich international fame. It also introduced her signature song, Friedrich Hollaender and Robert Liebmann's "Falling in Love Again ". The film is considered a classic of German cinema.