Originally published: Great Britain: Orion Books, 2010.

The final collection of four brand new utterly horrid stories; Horrid Henry's Bake-Off sees Henry and Margaret go head-to-head in a hotly contested baking competition, Henry triumphantly reveals his top tips in Horrid Henry's Extra Horrid Guide to Perfect Parents, he reads an interesting book about Evil Evie, a really naughty girl not too dissimilar to himself in Horrid Henry's Bad Book, and conjures up an ancient cannibal's curse to deal with his enemies and small, annoying brother in Horrid Henry's Cannibal Curse. Horrid Henry is illustrated by Tony Ross, who also illustrates David Walliams' children's books, as well as his own picture books.

Four brand new stories in which Horrid Henry helps himself to all the money he needs to win his favorite board game, comes up with another spectacular money-making scheme for launching a newspaper with all the school gossip, vows vengeance on Perfect Peter when Peter steals his birthday party theme and has his own Pirate Party—and gets his revenge by taking over as head teacher when Peter plays school with his goody-goody friends.