Kostja, the German-Russian, and Beatrice, the German-African, have a big argument at night. Beatrice leaves the apartment and leaves Kostja behind with the baby, reinventing herself as an architect and psychologist, as an actress and screenwriter, while Kostja, the bicycle messenger, tries in vain to find somewhere to put his child. At some point he loses it. All three experience their odyssey through a Berlin summer day.