Jarl Dragonheart's granddaughter has almost come of age and is becoming a powerful witch. The Skull Taker clan wish to take revenge for the death of their own witch at Snorri's hands and take both Ylva and the land of the wolf from the Dragonheart. When Ylva falls into the hands of the Norns then Dragonheart must descend into the bowels of the earth and do battle with the most powerful of witches.