September 1, 1939. Sixty-year-old Janusz Korczak and the students and teachers at his Dom Sierot Jewish orphanage are outside enjoying a beautiful day in Warsaw. Hours later, their lives are altered forever when the Nazis invade. Suddenly treated as an outcast in his own city, Janusz – a respected leader known for his heroism and teaching – is determined to do whatever it takes to protect the children from the horrors to come.