East Germany, 1989. When 12-year-old Fritzi's best friend Sophie goes on vacation to Hungary, she leaves her little dog Sputnik with her. Fritzi lovingly takes care of Sputnik, who misses Sophie a lot. When school starts again, Sophie doesn't come back. She and her mother probably stayed in Hungary, like many other East Germans, hoping to reach the West from there. By chance, Fritzi stumbles into a demonstration. She sees the people around her risking arrest, committed to change their country for the better. Inspired, Fritzi now knows exactly what to do. She will help Sputnik find Sophie - no matter what! She got a postcard from Sophie from West-Germany, so she has a lead and decides to follow Sputnik across the heavily guarded border on her own.