Arthur Fleck, a party clown and a failed stand-up comedian, leads an impoverished life with his ailing mother. However, when society shuns him and brands him as a freak, he decides to embrace the life of crime and chaos in Gotham City.
As a storm rages, a young girl is kidnapped. Her mother teams up with the mysterious woman next door to pursue the kidnapper, a journey that tests their limits and exposes shocking secrets from their pasts.