Marty DiBergi, a film-maker and a diehard fan of Spinal Tap, a British heavy metal band, makes a documentary of their American comeback tour that includes interviews with each band member.
The movie shines a light on the self-contained universe of a metal band struggling to get back on the charts, including everything from its complicated history of ups and downs, gold albums, name changes and undersold concert dates, along with the full host of requisite groupies, promoters, hangers-on and historians, sessions, release events and those special behind-the-scenes moments that keep it all real.