The true story of a German agent sent to the USA in 1944 in order to stop the development of the atomic bomb.

A German expedition is in the African jungles on an unidentified misson. During this mission one of the German explorers, Thoren, is attacked and captured by the local natives called the Botos.

Sabine Schröder, who works as a hairdresser's assistant in a small town, feels called to higher things: to acting. She gets on everyone's nerves with her madness: her boss, her parents and above all her fiancé, the car mechanic Jürgen. One day, when Schröders received a letter from a Berlin film company, the father burned it unread. Out of disappointment, anger and defiance, Sabine packs her bags and makes her way to Berlin, where the film festival is taking place.

East Berlin, shortly after the construction of the Berlin Wall. Kurt Schröder and his family dig a tunnel to escape to West Berlin as they struggle to overcome the obstacles blocking their underground path to freedom.