Jaclyn cannot figure out why her Aunt Greta moved them to the tiny Arctic village of Sherpia where the townspeople are all living in fear of the Snowman, an evil creature that lives in an ice cave on top of a nearby mountain, but then she learns a secret that changes her life.

Kelli and Shawn Andersen are not excited about having to move to another state--especially because their new home is directly next to a giant swamp. But their dad is a scientist and he's going down there to study the local flora and fauna. Unfortunately for Kelli and Shawn, there seem to be some very strange creatures that live around their house. They keep hearing about the legend of the Shaggedy, an ancient beast that lives far below the surface...