"The Underground Man" is a novel by Mick Jackson that tells the story of William Cavendish-Scott-Bentinck, the fifth Duke of Portland, who lived in the 19th century. The novel explores themes of isolation, madness, and the search for meaning in life. The Duke is a reclusive and eccentric character who spends much of his life building an elaborate series of tunnels beneath his estate. As the novel unfolds, we learn about the Duke's troubled past, including his difficult relationship with his father and his own struggles with mental illness. Jackson's writing is both humorous and poignant, capturing the absurdity and tragedy of the Duke's life. "The Underground Man" is a thought-provoking and beautifully written novel that delves deep into the human psyche and the complexities of the human experience.