This widely praised by critics film was created with cooperation from Paul McCartney, Ringo Starr and the widows of John Lennon and George Harrison. Filmmaker Peter Jackson delves into invaluable footage archives to make a film that shows the truth about the Beatles recording together the album Let it Be, which had the working title of Get Back. The production employed film restoration techniques developed for Jackson's previous works on sixty hours of film footage and 150 hours of audio, spending four years in editing the series. The final cut covers 21 days in the studio with the Beatles and climaxes with the full 42-minute rooftop concert.
In part I, the Beatles begin rehearsing at Twickenham Studios for what is at first meant to be a television special about the recording of their next album leading up to a live show at a location to be determined. During the sessions, Paul McCartney and George Harrison play some songs that would later appear on their respective solo albums. After seven days of rehearsals, Harrison abruptly leaves the group.

Rehearsals briefly resume amid uncertainty over the band's future. Following a productive meeting with Harrison, the Beatles agree to abandon the idea of a live show and relocate to their Apple Corps studio to formally record the new album. Billy Preston, a musician the group met in Hamburg, joins in on the sessions on electric piano.

The Beatles continue recording as the deadline for completing the project, caused by Ringo Starr's filming schedule for The Magic Christian, approaches. McCartney continues to hope that the band will perform live for an audience and Lennon meets American businessman Allen Klein for the first time. On the penultimate day, the Beatles perform an unannounced concert on the roof of the Apple Corps building, attracting crowds of passers-by as well as the attention of the Metropolitan Police.