Forever alone in a crowd, failed comedian Arthur Fleck seeks connection as he walks the streets of Gotham City. Arthur wears two masks -- the one he paints for his day job as a clown, and the guise he projects in a futile attempt to feel like he's part of the world around him. Isolated, bullied and disregarded by society, Fleck begins a slow descent into madness as he transforms into the criminal mastermind known as the Joker.
Sebastian (Ryan Gosling) and Mia (Emma Stone) are drawn together by their common desire to do what they love. But as success mounts they are faced with decisions that begin to fray the fragile fabric of their love affair, and the dreams they worked so hard to maintain in each other threaten to rip them apart.
When renowned crime novelist Harlan Thrombey dies just after his 85th birthday, the inquisitive and debonair Detective Benoit Blanc arrives at his estate to investigate. From Harlan's dysfunctional family to his devoted staff, Blanc sifts through a web of red herrings and self-serving lies to uncover the truth behind Thrombey's untimely demise.