Jane Hudson (Bette Davis) is an aging child star left to care for her wheelchair-bound sister Blanche (Joan Crawford), also a former child actress. Stuck living together in a mansion in old Hollywood, Blanche plots to get even with Jane for the car crash that left her crippled years earlier. But Jane is desperate to keep Blanche imprisoned as she plans a new rise to fame, and tries to hide Blanche's existence from doctors, visitors, and neighbors while she devises a way to get rid of her sister.