"We will need you as Crossers, and we will need you not only to be brave—but to be fearless." Mr. Darby paused, giving the scouts time to digest his words. Then he continued. "I want you to think before answering. Can you accept this challenge?"Only weeks after their return from the Secret Zoo, Noah and his friends must go back—and face their biggest challenge yet. With monstrous sasquatches freely attacking the denizens of the zoo and the evil Shadowist at large, the fate of the world is at stake. As Crossers, Noah, Megan, Richie, and Ella would help protect the zoo from these dangers. But do they have what it takes to complete their training? And what other secrets are hiding in the shadows?