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The explosive conclusion to Lindsay Cummings's epic fantasy adventure series about a magical world at the center of the earth that New York Times bestselling author of the Seven Wonders series Peter Lerangis says is "filled with imagination and sneaky humor." In this third book, perfect for fans of Brandon Mull and Lisa McMann, the Balance Keepers must fight a dangerous traitor in an epic battle of magic.Albert and his Balance Keepers teammates have been called back to the Core for immediate action! There's a serious Imbalance in the fantastical underground Realm of Belltroll. Without intervention, everything from New York to Yellowstone above could be swallowed by earthquakes. It's clear the mysterious traitor who caused last term's chaos is at it again, and with a vengeance.