What is the title of the fourth book of Sue Townsend's 'Adrian Mole' series?

"Adrian Mole: The Wilderness Years" is the fourth book in the Adrian Mole series, written by Sue Townsend. It focuses on the worries of the, now, adult Mole. The book was first published in 1993 by Methuen. It is set in 1991 to the first part of 1992 and Adrian is 23¾ years of age.

The book covers the same themes as the first volumes and continues the regular format of a diary.

The book charts the progress of Adrian's wavering love life; he begins infatuated, as ever, with Pandora Braithwaite, with whom he is sharing a flat in Oxford (although as her boyfriend Jack Cavendish also lives there, chances of romance are slim). His chasing after Pandora finally ends when she finds Adrian's list of ways of torturing her current partner and recommends a psychotherapist, Leonora de Witt, with whom Adrian is immediately smitten. Leonora fends off all of Adrian's attempts to get to know her better, and indirectly leads him to his next love, Bianca, an engineer from London. His relationship with Bianca is fully enjoyable and looks promising until she runs off with his mother's husband, Martin (also an engineer). However, he soon meets Jo Jo, a worker at Savage's, a horrible Soho restaurant where he found employment.