Achak is a free-spirited, hot-headed, and headstrong werewolf of the dark mountain pack. But one terrible night, werewolf-hunter Julia La Lune attacked and killed the whole pack but Achak. He finds clues that say, that his twin sister Mai survived too. After searching for over five hunting seasons without finding her, Achak gives up and leaves his old territory, thinking he's the only werewolf left. Soon he will find out that that isn't quite the truth...