Jo March (Saoirse Ronan) reflects back and forth on her life, telling the beloved story of the March sisters - four young women, each determined to live life on her own terms.
In Gotham City, mentally troubled comedian Arthur Fleck is disregarded and mistreated by society. He then embarks on a downward spiral of revolution and bloody crime. This path brings him face-to-face with his alter-ego: the Joker.