Between the Blade and the Heart by Amanda Hocking -blogtour-

Game of Thrones meets Blade Runner in this commanding new YA fantasy inspired by Norse Mythology from New York Times bestselling author Amanda Hocking.
As one of Odin’s Valkyries, Malin’s greatest responsibility is to slay immortals and return them to the underworld. But when she unearths a secret that could unravel the balance of all she knows, Malin along with her best friend and her ex-girlfriend must decide where their loyalties lie. And if helping the blue-eyed boy Asher enact his revenge is worth the risk—to the world and her heart.