There's only one passage between the Upper World and Droon -- the magical rainbow staircase. At least, that's what Eric and his friends have always believed. But now Ko and his beasts are attacking Zorfendorf Castle, a magical fortress that's hiding a huge secret: the Fifth River, another passage to the Upper World. Ko will do anything to get to the river -- and to the Upper World. And Eric, Julie, Neal, and Keeah will do anything to stop him!
Tony Abbott is the author of more than ninety books for young readers, including THE SECRETS OF DROON series; middle-grade novel KRINGLE; and THE HAUNTING OF DEREK STONE series. He was the recipient of the 2006 Golden Kite Award, as well as the 2009 Edgar Award. Tony was born in Ohio, and now lives with his wife and two daughters in Trumbull, Connecticut. Visit him online at www.tonyabbottbooks.com.