Dark Lord of Derkholm

"Derk, an unconventional wizard, and his magical family become involved in a plan to put a stop to the devastating tours of their world arranged by the tyrannical Mr. Chesney."
"Derk, an unconventional wizard, and his magical family become involved in a plan to put a stop to the devastating tours of their world arranged by the tyrannical Mr. Chesney."@en
"A hilarious adventure about a fantasy world in danger of destruction from that most vile of threats...tourism .Winner of the Mythopoeic Fantasy Award for Children's Literature in 1999. A humorous fantasy from Diana Wynne Jones. In a world next door to ours, the tourist industry is devastating the population by its desire to experience all the fantasy cliches - Dark Lords, impoverished villages, dragons etc. The Head of the University resolves to shut the tours down; the only problem being the ruthless tour-master - and his all-powerful demons. To save them all, the incompetent wizard Derk is appointed as Dark Lord in the hope that he will ruin the tours, and sure enough proceeds to fail at everything due to his general uselessness. But can failing at everything lead to a win this time?"@en