The fourth book in the action-packed and highly imaginative The Secret Zoo series, about a group of middle school friends who discover a hidden zoo in their very own neighborhood The zoo's archenemy, the evil DeGraff, is closing in for the first time since he was driven out of the Secret Zoo.

On Halloween night, Noah and his friends must battle terrifying sasquatches that have attacked their own elementary school. Little do they know the sasquatches are a trap When DeGraff captures three of Noah's friends, can the kids ally with their rivals in order to save every person and animal...