The Lost Swallow by Jayne Castel

All her life she’s trusted her instincts—but now she must follow her heart.
Mira belongs to The Swallow Guard—an elite all-female bodyguard who protect the royal family. She resents her role, and has been planning her escape for years. But when her city comes under attack she finds herself on the run, and the unlikely protector of a spoiled and wilful princess. Despite her desire to look after herself, she finds she can’t abandon the girl.

Meanwhile, far to the north, an enchanter receives a chilling mission.
Asher belongs to the Order of Light and Darkness and spends his days healing the sick and injured. Yet when the head of his order commands him to track down the last survivor of a slaughtered royal family—and kill the girl and the woman protecting her—he finds himself in the role of assassin.

In an epic journey through the heart of occupied territory, Mira struggles between her instinct to flee, her urge to protect the gifted young woman who has come to depend on her—and her attraction to an enigmatic stranger who says he’s been sent to help them. Asher must also make a choice. Does he trust his instincts, follow his heart, and bring wrath down upon him … or does he follow orders and risk losing his soul.