A four-year-old boy vanishes without a trace one evening from a playground in a high-rise neighborhood, sparking a frantic investigation. As initial leads prove fruitless, detective Martin Brühl races against the clock. The longer the search takes, the slimmer the chance of success becomes. Martin finds himself supporting the distraught mother, Dina Ritter, who had only turned to look away from her son for a moment. As tension builds, the community and investigators unite in a desperate attempt to solve the mystery and bring the boy back safely.