As Orka continues the hunt for her missing son, the Bloodsworn sweep south in a desperate race to save one of their own - and Varg takes the first steps on the path of vengeance.Elvar has sworn to fulfil her blood oath and rescue a prisoner from the clutches of Lik-Rifa and her dragonborn followers, but first she must persuade the Battle-Grim to follow her.Yet even the might of the Bloodsworn and Battle-Grim cannot stand alone against a dragon god.Their hope lies within the mad writings of a chained god. A book of forbidden magic with the power to raise the wolf god Ulfrir from the dead . . . and bring about a battle that will shake the foundations of the earth.