How To Steal A Dragons Sword (Book 9th in the how to train your dragon series)

I DO NOT CLAIM BY ANY RIGHT TO SAY THAT I PUBLISHED THESE BOOKS BUT GIVE FULL CREDIT TO CRESSIDA COWELL AND DAVID TENNENT FOR THESE BOOKS. 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.