The Doomsday of Yule has arrived, and the future of dragonkind lies in the hands of one boy with nothing to show, but everything to fight for. Hiccup's quest is clear. But can he end the rebellion? Can he save the dragons? The stakes have never been higher, as the very fate of the Viking world hangs in the balance.

Cressida Cowell is the #1 internationally bestselling author and illustrator of The Wizards of Once and the How to Train Your Dragon series. She grew up in London and on a small, uninhabited island off the west coast of Scotland, where she spent her time writing stories, fishing for things to eat, and exploring the island. She now lives in Hammersmith, England, with her husband, three children, and a dog named Pigeon.