Cast aside by Hollywood, screen legends Joan Crawford and Bette Davis battle ageism, sexism and each other when they sign up to make "What Ever Happened to Baby Jane?"
With production on the film underway, Bette and Joan form an alliance, but outside forces conspire against them.
As the film production reaches its climax, the feud becomes physical; Bette's relationship with her daughter becomes strained when she bonds with a new cast member; Joan reveals an intimate detail about her past.
Bad word-of-mouth plagues "What Ever Happened to Baby Jane?" on the eve of its release; Bette and Joan brace for failure; Pauline tries to break gender barriers; Oscar nominations are announced.
Bette is on track to win a record-breaking, third "Best Actress" Oscar; Joan and Hedda launch a clandestine campaign against Bette.
Hungry for another hit, Warner pressures Aldrich to bring the original team back together for a follow-up horror film; someone from Joan's past poses a threat.
With production of "Hush... Hush, Sweet Charlotte" underway, the feud intensifies when Joan learns of a new producer on the project; Bette reveals her vulnerabilities to Bob in an unguarded moment.
Joan accepts a leading role on a new film despite her deteriorating health; faced with a new rival, Bette reflects on her misplaced feud with Joan.