Adrian Mole and the Weapons of Mass Destruction joke in the book is that Adrian does not know whether Mr Carlton-Hayes' partner Leslie is a man or a woman; this is never made clear. Although they are from different backgrounds, he and Adrian share an appreciation of literature, contempt for Michael Flowers, and a similar reservation about expressing their feelings. It is revealed in that Leslie is a man and implied they both left their wives for their relationship. Pauline is Adrian's mother, and plays less of a role in the story than in previous books. Like Adrian, Pauline is inclined to spend using money she hasn't got.
The Big Bubble: Part Four of the Mole Trilogy on continuing the idea. "The Big Bubble" is similar to "The Tunes of Two Cities", as it focuses on the music within the Mole culture. In this case, the album presents some songs by a fictional band called The Big Bubble. The band forefronts the Zenkinite movement, the Zenkinites being a crossbreed of the Moles and Chubs which were introduced in "Mark of the Mole". The band breaks the law by singing in the banned Mohelmot language. The four models portraying the Big Bubble on the cover have never been identified. Despite rumors, the Residents claim that they themselves are