In this epic conclusion to the Starling trilogy, Mason Starling has taken up the Spear of Odin and has begun the series of events that marks the end of the world.
After Mason crosses over into the realm of the Norse gods, Fenn descends into the underworld and races against fate to find Mason and bring her home before she can be transformed into a Valkyrie, which would set the end of the world in motion.
Surviving a supernatural storm that has decimated her school, Manhattan teen Mason Starling discovers her magical link to ancient Norse mythology and bonds with a stranger, Fennrys Wolf, who has no memory of his identity.
