Horrid Henry accompanies his father to the office, hacks into his parents' computer, meets the Demon Dinner Lady and plans the ultimate revenge on Perfect Peter.
"I was collecting funny stories about dinner ladies when a friend told me about a dinner lady at her daughter's primary school who used to snatch food from the kids. The demon dinner lady was born on the spot. And I should also say that the bit in Horrid Henry's Revenge where Henry leaves Peter stuck up a tree at midnight is based on a true story. Believe it or not, that boy grew up to be a teacher!"