Imagine... John Lennon's childhood. Liverpool, 1955: a smart and troubled fifteen-year-old is hungry for experience. In a family full of secrets, two incredible women clash over John (Aaron Johnson): Mimi (Kristin Scott Thomas), the buttoned-up aunt who raised him, and Julia (Anne-Marie Duff), the prodigal mother. Yearning for a normal family, John escapes into the new and exciting world of rock 'n' roll where his fledgling genius finds a kindred spirit in the teenage Paul McCartney (Thomas Brodie Sangster). Just as John begins his new life, tragedy strikes. But a resilient young man finds his voice - and an icon explodes into the world.