Sebastian 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, 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 is on vacation in the mountains. At a rest stop Nick disappears out of the car and so for Sebastian a nightmare begins.