An in-depth look at the 1968 animated Beatles' Yellow Submarine film, featuring excerpts from 30 years worth of interviews with the film crew punctuated by many rare photos and pieces of production art. The book is divided into segments with story told predominantly through quotes from the artisans themselves - complete with conflicting tales and some fuzzy remembrances. Also included is a wealth of material concerning the film's 1999 re-release, as well as a dissection of the broad variants of the story which were published in books, magazines and comics at the time of the movie's original release.

An additional chapter regarding the film's symbolism was cut from the book but was made freely available for reading at Hieronimus' www.21stcenturyradio.com website, along with a lot of additional information about the film and tributes to the deceased production team. Hieronimus has also announced plans for a revised and expanded edition, though it has yet to come to fruition.

Prior to the book's publication, in 1999 Hieronimus self-published a 56-page glossy magazine titled "The Hieronimus & Co. Yellow Submarine Journal" with excerpts from the then-forthcoming book (which was originally to have been titled "It Was All In The Mind: The Creation of The Beatles Yellow Submarine").