Horrid Henry Rules the World is a collection of ten humorous stories centered around Horrid Henry's school adventures. In these tales, Henry attempts to avoid Nurse Needle's injections, sabotages Miss Impatience Tutu's dance class, feigns illness to skip school, dreams of meeting the Queen, strives to win at football, and aims to star in the Christmas play. Throughout these escapades, Henry imagines himself as King Henry the Horrible, commanding everyone to do his bidding. However, he soon learns that life isn't as simple as he wishes. The book also includes bonus materials such as a spot-the-hidden-object picture, Henry's inventive sick notes, a letter from Buckingham Palace, pages from his diary, and photos from the school yearbook, adding extra fun to the reading experience.