Die unsichtbare Front

The story centers on Ellen Lange, who escapes to join her brother Rolf in Kiel. Despite his attempts to send her back, she travels to Berlin and finds work in a music store. Her journey takes a turn when she is sent to Copenhagen with a false passport to deliver a violin containing stolen documents.

In Copenhagen, Ellen encounters Erik Larsen, a German secret service agent. Her decision to join the service represents her effort to make amends for her earlier actions. The film explores themes of loyalty, sacrifice, and the complexities of war, making it a significant entry in the drama genre of the early 20th century.