MacNamara is a managing director for Coca Cola in West Berlin in 1961, just before the Wall is put up. When Scarlett, the daughter of his boss, comes to West Berlin, MacNamara has to look after her, but this turns out to be a difficult task. After MacNamara has found out that Scarlett is seeing an East German communist named Otto, he goes to extreme lengths trying to conceal this from the girl’s father in order to save his job.