In the Fall of 1963, a Korean War veteran and criminal pleads insanity and is admitted to a mental institution, where he rallies up the scared patients against the tyrannical nurse.
12-year-old Mathilda is reluctantly taken in by Léon, a professional assassin, after her family is murdered. An unusual relationship forms as she becomes his protégée and learns the assassin's trade.
During WWII, acclaimed Polish musician Wladyslaw faces various struggles as he loses contact with his family. As the situation worsens, he hides in the ruins of Warsaw in order to survive.