Arrth, a Bigfoot tween, has lived a sheltered life until he runs into a skin-faced human. When the ugly monster tries to shoot an innocent rabbit, Arrth must act. His brave deed backfires. Somehow the skin-faced thief has stolen part of Bigfoot Valley's cloaking shield and now the Bigfoot clan is in danger of discovery. Or worse, total destruction. It's clear that Arrth is the only one who can save the clan. He will have to track down the thief and retrieve the missing device. To do this, he must leave the safety of Bigfoot Valley in the desperate hope of saving his kind.