Hiccup Horrendous Haddock III was an awesome sword-fighter, a dragon-whisperer and the greatest Viking Hero who ever lived. But it wasn`t always like that. Hiccup`s memoirs look back to when Hiccup was just an ordinary boy, and finding it very hard to be a Hero. What happens when someone says `Do Not Open This Box`? Hiccup Horrendous Haddock the Third, now in pirate training, finds out when the box is opened not once, not twice, but three times!