Frederike and Fabian, both 10 years old, plan a secret experiment: They want to teleport away their friend Jonathan. But everything goes wrong and instead of the boy all the people of their hometown disappear. Even school is deserted. They look for the source of complications. In the TV programme they watch pictures of people climbing up the Wall or driving into the West with their "Trabbis". In this second the three children know: They accidentally teleported the population of their town to West Berlin. They have to reverse the experiment, to save their neighbors, friends and families. An adventure story about November the 9th in 1989. 天啊！我们把柏林墙传输走了！ 今天实验室里面出现了状况。严重的状况！