Noah and his friends in the Secret Society join forces with four teens known as the Descenders to try to protect the Secret Zoo hidden behind the Clarksville City Zoo from monstrous sasquatches and the evil Shadowist.

"On Halloween night, the scouts, along with their Descender allies, must battle terrifying sasquatches at their own elementary school. Little do they know, the sasquatches are merely the bait to a trap. DeGraff captures three of the Descenders and drags them into a frightening, off-limits sector of The Secret Zoo. Meanwhile, Noah and his friends must protect two of their animals allies from police officers who are convinced that they are dangerous...

"Hidden beneath the regular Clarksville City Zoo, the Secret Zoo is an incredible world where animals and humans peacefully coexist as equals. But even in the Secret Zoo, there are dangers and forbidden places. When Noah and his friends discover tarantulas roaming around, they're sure the bad omen can only mean one thing: the Shadowist is nearby. Closing the portals is the only option to save all the animals at Clarksville City Zoo...But when Mr....