The world is full of magic...and it wants the Hero Squad dead. Winter in Kingsport heats up when the necromancer Black Betty comes to town, on the hunt for the Libris Infernalis, a legendary book of dark magic with the power to raise hell on Earth...literally. Facing power beyond their understanding, the Hero Squad turns to the Protectorate's resident sorceress for help, but the mysterious Dr. Enigma seems to have an agenda of her own. Is she on the side of angels, or is she a devil in disguise?