Laurel is one of Odin's top Valkyries. He sends the twenty-year-old into battles first, reaping the souls of the fallen for his future war

Marisol is the youngest Valkyrie fresh out of Odin's Games—a trial to weed out the weak. At sixteen, she has proven why she is one of the elite by never backing down even if she did have to stand against a pack of wolves, alone.

When Odin sends the new Valkyries, including Marisol, Laurel's sister, into a realm where no Valkyrie has returned, Laurel ignores her orders and hurries into the land of Grey after her baby sister.

The moment Laurel steps foot in the barren landscape, she discovers a war has exploded between the Shifters and Valkyries. Without stopping, she will fight her way across the realm uncovering ancient prophecies, forming bonds with Odin's enemies and realizing the true meaning of sisters.