What was the title of Roald Dahl’s only novel written for adults?

Roald Dahl’s only novel written for adults was My Uncle Oswald.

Published in 1979, the comic novel follows Oswald Hendryks, a wealthy and highly enterprising Englishman who becomes involved in an extraordinary scheme involving famous men and a fertility-related invention. The book is deliberately outrageous and satirical, reflecting Dahl’s adult fiction rather than his children’s storytelling.

Dahl is much more closely associated with children’s novels such as Charlie and the Chocolate Factory and Matilda, so My Uncle Oswald is sometimes overlooked. It is also easy to confuse the novel with Dahl’s adult short-story collections, including Kiss Kiss and Switch Bitch, but those are collections rather than novels.

The book belongs to the same mischievous tradition as Dahl’s adult stories, which often combine black comedy, ingenious plots and morally dubious characters. Oswald himself also appears in some of Dahl’s shorter adult fiction.