From the publisher
Trapped! The rainbow stairs have vanished. Eric, Neal, and Julie are stranded in Droon. And young Sparr and Gethwing have escaped to the Upper World! Now it's up to Eric and his friends to bring the stairs back — fast. Even if it means taking a journey through time, across the sands off Droon’s dark, dangerous past. A magical voyage awaits the kids, full of big adventure and even bigger secrets. And this time, there's more at stake than ever — not just in Droon, but in the Upper World, too. . . .