In the north, the people of an isolated silver mining community turn into vicious "beasts" who kill any person they come across. The mines belong to the noble family of Prince Anton - the ruler of Seon Castle and the patron of Celine and Amelie. Anton's domineering father ordered his son to solve this mysterious problem as a test of his ability to rule. He has no choice but to send witches to the dangerous north to use their abilities and find out the cause of the metamorphosis. Given how much they owe to the prince, the sisters have no choice but to get to work. Together with their fierce protector, Lieutenant Jaromir, Celine and Amelie enter the dark world of a remote mountain camp, undermined by fear, mistrust and slavish obedience, and pursue the men , without any warning, turning into huge, crazy wolves. They are forced to rely on their own strength and cunning. The sisters never thought that these powers could be used not only to solve the mystery, but also to survive...