Country music legend Jack Maine's (Cooper) struggles with alcohol have affected his career, but when he meets the beautiful and talented singer-songwriter Ally (Lady Gaga) at a bar, he begins to turn his life around. The two of them begin a romantic relationship, and with his help and connections, she begins to build her own musical career. As Ally's fame begins to eclipse Jack's, he finds himself drawn back to his destructive habits, but his personal issues don't just affect his own career anymore, but Ally's as well.
Upon his return after fighting in the Crusades, Lord Robin of Loxley (Egerton) discovers that he's been declared dead, and his land and wealth have been seized. In fact, many of England's citizens have had their wealth stolen by the sheriff of Nottingham (Mendelsohn), who is using it to fund a war. Little John (Foxx), the father of a boy whom Robin tries to save, convinces him to fight against the injustice, and together they begin stealing back the people's money and distributing it to the poor.
Once-successful biographer Lee Israel (McCarthy) has been struggling since the flop of her most recent book, and her agent seems unable to secure her any more work due to a belief in the industry that her style of biography is no longer in demand. Desperate for money, she begins forging and selling letters by deceased actors and writers using her friend Jack (Grant) as a liaison between herself and potential buyers. As their fraud continues to fetch fantastic sums of money, the pair find themselves turning to even more daring crimes. This film is based on a true story.