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The kids of The Apex raid a musical car before descending on a village of unsuspecting turtles - but before they can complete their mission, leaders Grace and Simon are separated from the pack under mysterious circumstances.
Grace and Simon look on the bright side and hope that this will be like a mini-vacation from their responsibilities as leaders of The Apex. However, their vacation is cut short when they realize they're being hunted by a terrifying creature in the woods.
In Book 3, Grace and Simon are the leaders of the Apex, an anarchic group of kids on a mysterious train. During one of their destructive missions, Grace and Simon get separated from the rest of the Apex and must find their way back. As the duo navigate through the myriad worlds of the train, they meet Hazel, an optimistic young girl, and Tuba, her gentle gorilla companion. Will Grace and Simon find new inspiration in Hazel's innocence, or will the ways of the Apex recruit yet another aboard the train?