Follows the further adventures and misadventures of Hiccup Horrendous Haddock the Third as his Viking training continues and his father leads a stranger and the Hairy Hooligans to the Isle of Skullions in search of a pirate's treasure.

Returning to his northern home, Uhtred of Bebbanburg finds himself caught up in the takeover crusade of a self-proclaimed ruler of Northumbria, a situation that culminates in a midnight siege on a seemingly impregnable city.

"Reluctant hero 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." - back cover

His blood is SaxonHis heart is VikingHis battleground is EnglandAnd while Uhtred might have regained his family's fortress, it seems that a peaceful life is not to be - as he is under threat from both an old enemy and a new foe. The old enemy comes from Wessex where a dynastic struggle will determine who will be the next king. And the new foe is Skoll, a Norseman, whose ambition is to be King of Northumbria and who leads a frightening army of wolf-warriors,...

Hiccup, stranded with Toothless on the Beach of the Broken Heart and being hunted by an old enemy, faces Ug the Uglithug, Berserks, and Scarers and tries to save Fishlegs from the Beast.

Chronicles the adventures and misadventures of Hiccup Horrendous Haddock the Third as he tries to pass the important initiation test of his Viking clan, the Tribe of the Hairy Hooligans, by catching and training a dragon.

In exile, and hunted by dragons and humans alike, can Hiccup the Viking find the dragon's jewel and save the world from destruction?

A young Viking is presented with the task of capturing and training a dragon in order to pass his clan's initiation test.

Hiccup Horrendous Haddock III tries to save his dragon, Toothless, from being banished, but first he must steal a carefully stored Viking book from the Meathead Public Library, where he is sure to encounter the Hairy Scary Librarian and his army of warriors and dragons.

Reluctant hero 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?