The book opens in January 1969, the beginning of The Beatles' last year as a band.

The Beatles (The White Album) is at number one in the charts and the foursome gather in London for a new project. Over 21 days, first at Twickenham Film Studios and then at their own brand-new Apple Studios, with cameras and tape recorders documenting every day's work and conversations, the band rehearse a huge number of songs, culminating in their final concert, which famously takes place on the rooftop of their own office building, bringing central London to a halt.