A thousand years after Ragnarok, the battle in which the Aesir and the Vanir were all but destroyed, Vidar, a son of Odin, must return to the Nine Worlds to face a threat greater than any he has ever known-a masked destroyer bent on finishing the devastation that Ragnarok started. Armed with a magical sword forged in violence, hatred, and blood, Vidar must lead his unlikely allies through Jotunheim, frigid realm of the frost giants-on a desperate mission to find and stop the madman in the mask before Vidar's universe is consumed in cold fire.