The official synopsis for the film is as follows:
Jack Malik is a struggling singer-songwriter in a tiny English seaside town whose dreams of fame are rapidly fading, despite the fierce devotion and support of his childhood best friend, Ellie. Then, after a freak bus accident during a mysterious global blackout, Jack wakes up to discover that The Beatles have never existed … and he finds himself with a very complicated problem, indeed. Performing songs by the greatest band in history to a world that has never heard them, and with a little help from his steel-hearted American agent, Debra, Jack’s fame explodes. But as his star rises, he risks losing Ellie — the one person who always believed in him. With the door between his old life and his new closing, Jack will need to get back to where he once belonged and prove that all you need is love.
The script is written by Richard Curtis, with Working Title’s Tim Bevan and Eric Fellner serving as producers, alongside Matt Wilkinson and Bernie Bellew, as well as Boyle and Curtis.