Gretta (Keira Knightley) and her long-time boyfriend Dave (Adam Levine) are songwriting partners who go to New York City when Dave lands a deal with a major record tag. But the excitement of Dave's new-found fame affects the couple in unexpected ways, leaving Gretta unsure of her future; until Dan (Mark Ruffalo), a scruffy record tag executive with a few problems of his own, stumbles across her performance on an East Village stage. Dan is immediately captivated by Gretta's raw talent and unique sound, leading to a life-changing collaboration, set to the soundtrack of a summer in New York City. Begin Again, from writer-director John Carney (ONCE), depicts a journey where lost souls meet and make beautiful music together.