Some years after the events of Joker, Arthur Fleck languishes in prison even though his infamy spreads throughout Gotham. In a drug-induced haze, he wastes away in Arkham Asylum as he’s evaluated if he’s mentally competent to stand trial.

His lawyer, Maryanne Stewart, pushes the narrative that Arthur has a split personality and that his darker half, the Joker, is responsible for the crimes he has committed. Completely spent of any emotion or care, Arthur does not protest. He is a shadow of his former self.

However, things change when Arthur meets fellow inmate Lee Quinzel. She is an obsessed fan of the Joker and risks punishment to get to know him. When the two meet, it is like fire and fuel combining – literally and metaphorically.

Lee snaps Arthur out of his daze, and he finds a new reason to live and fight for his freedom. But as...