A pack (flock?) of Pterolycus live peacefully in the forest of the magical Moonscar Island, home to the intelligent winged wolves. However, a growing threat looms over their heads. The threat of chaos, violence, disorder, and pain caused by the arrival of them. The demons. A dangerous and selfish Pterolycus plans to set them free from the Underlands to take over Moonscar Island for himself and his followers. Can a small group of young Pterolycus stop him? Or will he free the demon armies?