In Nazi-occupied Holland, Otto Frank and his family have decided to go into hiding due to the increasing persecutions against Jews. The businessman Kraler and his assistant Miep prepare a secret annex above their place of business, they arrange for the Franks and another family, the Van Daans to stay. Soon after they are joined by the dentist Dussel. Together the try to avoid detection but meeting basic needs can become a challenge. Later on the are found by the Nazis and put in separate by concentration camps put to work. Many years after Otto Frank returns to the secret annex and finds Anne Frank's diary.