Pologne, pendant la Seconde Guerre mondiale. Martha Weiss, une femme juive, arrive au camp d'extermination d'Auschwitz avec sa famille. Elle se voit attribuer le rôle d'interprète, mais ses proches ont beaucoup moins de chance.
Nights and Days is a family saga of Barbara Ostrzeńska-Niechcic, and Bogumił Niechcic, against the backdrop of the January Uprising of 1863 and World War I. The film is a rather straightforward and faithful adaptation of a novel by Maria Dąbrowska with the same title. The plot is woven around the changing fortunes of a noble (upper-class) Niechcic family in the pre-WWI Poland. There are two main crossing threads: a social history one and an existential one.