Elke repairs the radio in the compartment and everyone hears the news: A wall is being built through Berlin and along the state border to seal off the Soviet zone.

In the inter-zone train to East Berlin, people listen to the distressing radio reports. At the same time, we get insight into the lives of other people on this August 13, 1961 - the day when the Berlin Wall is erected and begins to separate its residents from the rest of the world.

The situation comes to a head with debates about idealism and disappointment, values of the East and the West, and freedom and control. As decisions are made, personal relationships begin to falter.

The pressure on the train passengers increases as the train gets closer to East Berlin. Political views and personal desires and fears differ greatly, making it very difficult for couples to reach a decision.

The train is approaching Bamberg, causing the passengers to speak frankly with one another. Gerd is standing in the corridor and Marlis is sitting in the compartment. What will he decide?

The investigator Arthur gets one step closer to uncovering the secret behind the mysterious substances found in the baby carriage. Train driver Edith and Kurt, the cameraman, are also getting to know each other better.

Arthur now questions Christa Hartmann more thoroughly. Marlis and Gerd find themselves in a severe conflict. Their different views on future and responsibility put their relationship to the test.

The closer the train gets to East Berlin, the more everyone comes under pressure and increasingly loses their nerve. Paul Fuchs is also at the end of his strength.

In this episode, Edith receives a mysterious call from the People's Police. Arthur interrogates the young gymnast but doesn't get the answer he expects.

The imminent division of Germany is marked by deeply personal moments centered on love, freedom—and a little promise that can mean the world.

Personal desires and political reality are forcing all involved to make decisions now. Willi and Elke have found a solution for themselves, but the adults are having a harder time finding common ground.

In the end, only love remains, as can be seen in this part. Particularly during a final song performed by the band, a few tears are shed as the reality of the situation sets in.

Just before reaching the final stop in the West, Rudolf opens up about the past he has tried to forget. Sabine, the gymnast, makes a brave decision, and Sascha remains on the train without his friends.

Pierrot and Dickie have completed their training as spaceship pilots and are now looking forward to new challenges. Soon, the two arrive for their first mission, which is to identify an unknown flying object.

An unknown flying object appears on the radar. Pierre, Pierrette, and Maestro discuss where it might come from and whether it might be hostile.