When the pictures from Bergamo in Italy go around the world in spring 2020, even non-medical people know what the word pandemic means. The previously unknown Coronavirus is spreading rapidly across the planet. Four days later, exit and contact restrictions also apply in Germany. Since then, the life of the Konstanz intensive care physician Dr. Carolin Mellau and her family on their heads. The female doctor becomes a member of the crisis team and is on duty around the clock to prepare the clinic for the impending emergency. As an anesthesiologist intubating those infected with COVID-19, she herself carries a high risk of infection. Meanwhile, her husband Stefan has to cancel his concerts as a musician, is no longer allowed to teach his music students and is suddenly sitting at home without an income. Teenage daughter Luzy is not allowed to see her Swiss boyfriend because the border is closed. She and brother Tim cannot go to school. But the worst case for the family is yet to come.

Sebastian (Mark Waschke) is a physics professor at the University of Jena and dealing for years with parallel universes. Meticulously, he tries to prove its existence scientifically. His college friend Oskar (Stipe Erceg), professor of theoretical physics at CERN in Geneva, smiles at Sebastian's firm belief in parallel universes and the many-worlds theory. In order to devote himself to the evidence in peace, Sebastian brings his son Nick to a summer camp, while his wife Maike (Bernadette Heerwagen) is on vacation in the mountains. At a rest stop Nick disappears out of the car and so for Sebastian a nightmare begins. Increasingly he is loosing more and more control. What really happened? It is fatal to his own theory? And who is this mysterious Schilf, which occurs abruptly in Sebastian's life?