For as long as Sigrid could remember, she's wanted to become a mighty, fearless valkyrie. But without a winged mare, she's a mere stable hand, left wondering who her parents were and why she's so different. So when the Eye shows her a vision where she's leading a valkyrie charge on the legendary eight-legged horse Sleipnir, she grabs the possibility of this greater destiny with both hands, refusing to let go. Too bad that the only one who can help her get there is Mariam, an enemy valkyrie who begrudgingly agrees to lead her to Helheim but who certainly can't be trusted--even if she does make Sigrid more than a little flustered. As they cross the nine worlds, battling night elves, riding sea serpents, and hurtling into fire to learn the truth about Sigrid's birthright, an unexpected but powerful bond forms. As her feelings for Mariam deepen into something fiery and undeniable, Fate has other plans for Sigrid. What happens when the one thing you think you were meant to do might end the nine worlds?

From the time she was born, Sigrid has only ever been ordinary. Being paired at birth with a plain horse—instead of the powerful winged mare of a valkyrie—meant there would be no warrior path for her. No riding the skies, no glory among the nine worlds. Just the simple, unremarkable life of a stable hand. Everything changes when a terrible enemy ambushes Vanaheim and Sigrid sees a vision of herself atop a mythical stallion, leading the valkyries into a harrowing battle. Finally, she can grab her future with her own two hands and become the hero of her own story…if she dares. But her destiny is tied up with Mariam, a fallen valkyrie who’s allied herself with the very enemy Sigrid is trying to stop. Now Sigrid has left ordinary behind as she begins a journey with the beautiful—if treacherous—valkyrie, each step bringing her closer to answers…and to awakened feelings for Mariam. But the life Sigrid left behind is starting to look a lot like paradise…especially when her destiny lies in the one place no mortal should tread: the gates of Hel.

Being both a valkyrie and a princess isn't turning out quite the way Sigrid imagined. The other valkyries still treat her like a stable hand. Her relationship with Mariam is less "long-distance" and more "worlds apart." And lately, she's been wondering if Sleipnir, her new horse, isn't making her a little bit...well, evil. But Sigrid's first official valkyrie mission sends ripples through the Nine Worlds. She's attracted the wrath of not only the Night Elves but their sinister king, who wants nothing more than to bring darkness down on everyone. Worse yet, Loki might just be interfering with the balance of light and dark... When war threatens the shores of Vanaheim and her friends are in danger of being exiled, Sigrid makes a deal with the new queen. She will ride Sleipnir against their enemies and use his might to defeat them, even as he pulls her closer to that line between good and evil. What she becomes will either save everyone...or unleash disaster upon them all.