Arthur Fleck continues to struggle with his torn identity and the grim reality of Gotham City. In the midst of his inner chaos, he meets the fascinating Harleen Quinzel, a psychiatrist who is drawn to his complex personality. Their relationship develops into an intense and dangerous bond that pushes both of them to their limits. As Arthur discovers his true nature, an unpredictable drama unfolds that could drag Gotham City into the abyss.