When an archaeologist excavating a top secret historical site realizes the magnitude of his discovery he requests help from treasure hunters Sam and Remi Fargo. And in rushing to join him, the husband and wife team are thrown into their most daring quest to date.

Hiccup Horrendous Haddock the Third is a smallish Viking with a longish name. Hiccup?s father is chief of the Hairy Hooligan tribe which means Hiccup is the Hope and the Heir to the Hairy Hooligan throne - but most of the time Hiccup feels like a very ordinary boy, finding it hard to be a Hero. When a huge, six-and-a-half-foot floating coffin with the words Beware! DO NOT OPEN THIS COFFIN arrives, can you guess what happens next? The Quest to discover...