Apparently the party of kids that ventured into the Wonka factory lost one of their number before the book ever saw print: Miranda Piker. Her encounter with some spotty powder turns into a very bad day for her family. Not sure how I missed this first time around, but this is definite Dahl territory: wacky and mostly disturbed.
And by the way, if you only know Dahl’s children’s stories, you need to grab his short stories, which–incredibly and sadly–appear to be out of print. Here’s an omnibus edition you can snag used.