Humans are coming to the home of the silver dragons. When Firedrake receives this message, he immediately suggests to the other dragons that they return to the Rim of Heaven, where they came from originally. With only vague memories from the most ancient dragon to guide him, Firedrake sets out with the brownie Sorrel to search for the Rim of Heaven. Along the way, they meet Ben, a lonely orphan boy who joins in their hunt, Twigleg the homunculus, and many more.

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Unknown to Firedrake and his companions, the golden dragon Nettlebrand is on a hunt of his own. He would like to find the Rim of Heaven as well, for he remembers the old days when he would hunt and devour the silver dragons.