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.

Based on an acclaimed novel by Adam Bahdaj, the series tells a story of a group of "difficult youth", set in 1960s Poland.

The dark world of crime: murders, racketeering, drugs, kidnappings. There are no rules here. Working in this world makes cops cynical and ruthless. There is a fine line between them and criminals - will any of them cross it? The main characters are officers from the Department for Counteracting Criminal Terror and Homicides. The action of the series is an extension of the threads that appear in the feature film. It presents in a realistic way the brutal and dark world of crime that officers encounter on a daily basis. They're not just tracking down murderers. They fight racketeering, kidnapping, drug trafficking while struggling with their own day to day life and problems.