In his 4th sidesplitting adventure, 10-year-old Hiccup Horrendous Haddock III must rescue his best friend, Fishlegs, from the deadly disease Vorpentitis. The only cure is rare and almost impossible to find: a potato. But where will Hiccup find such a thing? He'll have to dodge the terrible Sharkworms, battle Doomfangs, and outwit crazy Hooligans if he's going to be a Hero...again. A fast paced plot, slapstick humor, witty dialogue and imaginative black and white illustrations enhance this exciting tale.