I was inspired to read Ray Bradbury's Something Wicked This Way Comes from Steinbeck's Ghost because the Steinbeck-loving character also loved this novel by Bradbury. It's about two 13-year-old boys, Jim Nightshade and William Halloway, and their strange experience with a rather creepy carnival in October. It's a mix of fantasy and horror as well as an allegory of the struggle between good and evil.
It was a little dense and required more putting together than I expected out of a young adult novel, so it's certainly for a more advanced young adult reader. It was written in '62, though, so I guess that makes sense for the differences in language. But really, I didn't love it. It's just not a very clear story, or really my type of novel. I recommend it for those who can handle the density of the novel as well as enjoy the dark poetry of Bradbury and, perhaps, Tim Burton? It does remind me of Burton in general . . . But I digress. If you like creepy horror-esque stories, give it a go. If you find your style is generally more in line with me, give it a pass.