Boots' little brother, Edward, has arrived to start his first year at Macdonald Hall. Bruno can't wait to teach him all he knows, but Edward thinks they are "over the hill" and "old men". At the same time, Mr. Sturgeon is thinking about retirement, saying that school life poses "no challenge". Suddenly someone starts pranking the Hall, and this time it isn't Bruno and Boots! But no one believes them? Can they stop themselves from getting expelled and clear their name?