Ian, Kendra, and PJ have learned everything they know about being Gravediggers from their trusted teacher and friend, Warden O'Dea. They've battled the undead on a mountaintop and on a creepy island, and they're ready for more.

But when a vengeful ex-Gravedigger kidnaps O'Dea in a plot to release scores of zombies onto the earth, the kids' journey takes them deep into the caves of Indonesia to a lost city called Kudus. And if a terrifying breed of dangerous, evolved zombies isn't enough, there are plenty of unsettling surprises inside the group, too. Kendra is wrestling with strange new powers that she can't explain, while Ian realizes feelings for Kendra that he can't explain. And PJ has been handed a chilling prophecy about his future that he's afraid to share with his friends.

In this final installment of the series, the kids' Gravedigger skills and their friendship are put to the ultimate test. The fate of the human world rests on their shoulders-but will they escape Kudus with their lives