Ida Wüst was a German stage and film actress whose career was prominent in the 1920s and 1930s with Universum Film AG (UFA).

The Invisible Front is a 1932 German spy thriller film directed by Richard Eichberg and starring Trude von Molo, Karl Ludwig Diehl, Veit Harlan and Paul Hörbiger. The story was written by Robert A. Stemmle, Curt Siodmak and Max W. Kimmich, who also presented the idea of this film to his colleagues. It was made at the Johannisthal Studios in Berlin and on location in Hamburg. The film's sets were designed by the art directors Artur Günther and Willi Herrmann.