Thank you to Cracked.com for pointing out this one. Personally, I think this would be a hilarious read, but it's definitely an adult book and not appropriate for the children reading the likes of Dahl's more famous books like Charlie and the Chocolate Factory, James and the Giant Peach, Matilda, etc.
We all know that Doyle wrote the Sherlock Holmes books. A lot of us may also remember that he wrote the Professor Challenger series as well as historical novels. Heck, some of us may even know that he was really into spiritualism and some of his works - like Professor Challenger #3, The Land of Mist - deal with his beliefs. But writing a nonfiction endorsement of the Cottingley fairy photographs, later proved to be a hoax, seems to be stretching it a bit too much.
From the author of the classics A Passage to India, A Room with a View, and Howards End comes a dystopian novella. It's really good, too. Another unexpected novel from Forster is Maurice, which, being about a homosexual man, wasn't published until 1971.
Karen Hesse, author of fantastic historical novels in verse, is about to have her dystopian sci-fi novel published. Usually I think my dictum "every famous author wrote a speculative fiction book" applies just to Victorian novelists, but here we have it recurring in the modern world.
(Cough cough, my favorite book.) Lewis is well-known for his satirical novels like Main Street and Babbitt that attack middle-class American social life, but this particular book is a terrifying vision of what could have happened to the country during the Great Depression. It is, by far, the most realistic and hard-hitting of the dystopias I've read.
From the author of Lolita and Pale Fire comes a dystopian novel.
The Grapes of Wrath, Cannery Row, Of Mice and Men...and an Arthurian retelling.
Like Brideshead Revisited and Waugh's other novels, this book is satirical. Unlike his other novels, this is a dystopia.
I apologize that this is so dystopia-heavy, but it's the genre I've researched the most. It's really amazing how many Victorian authors wrote at least one speculative fiction story or novel - Jack London, Anthony Trollope, Upton Sinclair, H. Rider Haggard (I know he wrote fantasy - duh - but he also had a couple more sf-oriented works), W.E.B. Du Bois, Edward Bulwer-Lytton (of "It was a dark and stormy night..." fame). And then there's other authors like Cyrano de Bergerac...but I'll stop there.
Do you have any examples?