When Phoebe Meadows gets struck by a strange light in the stock room of Macy's, life as she knows it flies out the window. As if being hit by lightning isn't bad enough, she's accosted in the subway by a man with a missing hand, arrives home to find a raven on her kitchen counter, and her neighbor Ingrid shows up dressed like a gladiator, hell-bent on protecting her.

Before Ingrid can shuttle her off to safety, Phoebe is kidnapped and tossed into one of the Nine Worlds, where she's quickly forced to come to terms with what she is: a Valkyrie. The only problem is, she has no idea what that means.

After a narrow escape, she finds an unlikely ally in Loki's son, Fenrir. Together, the Valkyrie and the wolf must battle their way back to New York City and reach the Valkyrie stronghold where Ingrid is waiting for her. But with danger and obstacles at every turn, Phoebe might not live long enough to learn the full truth about who and what she really is.