This is book number 9 in the How to Train Your Dragon series.
The ninth adventure in the New York Times bestselling How to Train Your Dragon series
The How to Train Your Dragon series chronicles the adventures and misadventures of Viking underdog Hiccup Horrendous Haddock III and his dragon, Toothless. In book nine, a dragon rebellion is coming-filled with the meanest, nastiest dragons in the archipelago. Razor-wings, Tonguetwisters, and Vampire Ghouldeaths are attacking Vikings and seem to be seeking one soul in particular: Hiccup Horrendous Haddock the Third
Only a king can save them ... and only a champion with all of the king's lost things can be king. In his adventures, Hiccup has collected quite a few things himself. But can a scrawny Viking save the entire archipelago from certain doom? To find out, Hiccup will have to outwit a witch, fight his arch-enemy, and beat back an army of bloodthirsty dragons with just one sword.