Noah's sister Megan noticed some strange things happening at the local zoo. Like the animals leaving the zoo in the middle of the night, or suddenly appearing out of nowhere in exhibits. She started documenting the strange events in her diary. But Megan didn't notice the shadowy presence watching her. Then she disappeared! Now it's up to Noah and his two best friends to find her-sneaking around the nasty zoo workers intent on keeping them out. Luckily, the animals are on their side. With the help of polar bears, penguins, prairie dogs, and more, the adventurers make an astonishing discovery: behind the exhibit walls exists an alternate world, where humans and animals coexist as equals. And the world is under threat. The Secret Zoo is the gripping beginning of a brand-new series from debut author Bryan Chick.