Writer Johannes Pfeiffer who goes undercover as a student in a high school after his friends told him that he missed out on a great life experience since he was home schooled.
Railway employee Fritz Marr is not regarded well by his superiors. It is the year 1920, and trains regularly pass the railway hub of Erfurt to the East to secretly transport weapons for the fight against the young Soviet Union. Marr knows about this and wants to mobilise other workers to stop these illegal deliveries. To muzzle him, Marr is relocated to a remote rail work construction site.
A mechanic, Peter Papenbold, is giving all his free time to volunteer in the children's sport school. When he's asked to switch to teaching permanently - it's a very difficult decision for him.
Alexander Bukow est un flic qui n'hésite pas à travailler au bord de la loi pour obtenir des résultats. Sa partenaire, Katrin Koenig, est une maniaque du contrôle dont la vie est le métier. Ensemble, ils forment une excellente équipe de lutte contre le crime - quand ils ne se battent pas entre eux.