A struggling musician realizes hes the only person on Earth who can remember The Beatles after waking up in an alternate reality where they never existed.
In Lowestoft UK, Jack Malik is a frustrated musician whose musical career is going nowhere despite the faith that his friend/manager Ellie Appleton has in him. However, on the night Jack decides to give up, the whole world is momentarily hit with a massive blackout during which Jack is hit by a bus. Upon regaining consciousness, Jack learns to his astonishment that he is apparently now the only one who knows the music of the Beatles. Realizing this improbable opportunity, Jack begins playing the music of one of the worlds greatest rock bands, being forced to claim it as his own. It pays off quickly and Jack becomes a worldwide musical sensation. However, Jack finds himself drifting away from Ellie, only realizing his love for her when she has become intimidated by his success, which depends on a blatant plagiarization that no one could find out. Now, Jack must make a fundamental moral decision about his music to satisfy his conscience as he decides what he truly needs.
One day Jack was nobody. Everything was perfectly normal. Until on that one day, a global power outage occurred, affecting everything. The very next day, Jack discovers that he is the only one in the world who remembers The Beatles. Whilst trying to wrap his head around what is happening, Jack finds himself on a journey to figure out what happened on that one night, and to bring back joy and bring back the memory of the one band from yesterday.