Hiccup, the reluctant Viking hero, has three months, five days, and six hours to discover America, return to Berk, save his father, battle Polarserpents, and win the annual Inter-Tribal Friendly Swimming Race.

When an uprising of nasty dragons begins, it becomes clear that their main target is Hiccup Horrendous Haddock III, leaving the scrawny Viking no choice but to fight to defend his archipelago.

Nobody loves a good story like Justin's dad. He's a famous writer and story collector. That's how Justin and his sister, Marissa, ended up in Brovania. Their dad is searching for an ancient manuscript called "The Lost Legend." Justin and Marissa want to help. But instead of finding "The Lost Legend," they get lost. And the woods of Brovania are filled with the strangest creatures. Like hundreds of squealing mice. Silver-colored dogs. And terrifying...

In the Ninth century, a group of Vikings, is approaching Britain, aiming to plunder the rich monasteries in the north of the island. But their ship gets caught in a storm and is smashed to pieces on the rocks off the coast of Scotland, the only part of Britain without any Viking settlements. When the daughter of the Scottish King by chance falls into Viking hands, they see the opportunity for demanding a large ransom.

Their magic tree house takes Jack and Annie back to a monastery in medieval Ireland, where they try to retrieve a lost book while being menaced by Viking raiders.

When his best friend Fishlegs is stricken with Vorpentitis, Hiccup Horrendous Haddock III must outwit Sharkworms, Doomfangs, and Hooligans to find a potato--the rare cure for this deadly disease.

"A countdown of five of the most legendary Vikings provides thrills as readers explore the lives, weapons, and battle tactics of these Scandinavian fighters"--

Recounts the further escapades of Hiccup Horrendous Haddock the Third as he continues his Viking training during which he escapes from a boatload of Roman soldiers and searches for his kidnapped dragon.

The Vikings visit Glendragon, and Mike the Knight must make sure they stay out of trouble.

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.