The Demon's Daughter (Demon Outlaws #1)

Hunter is the only man capable of killing the demons that left the
world in ruins. But when he’s hired by a notorious priestess to bring
a thief to justice, the Demon Slayer gets more than he bargains for.

Airie was raised in an abandoned temple as a priestess’s daughter,
having no idea of her true origins. In a time when any half-breed
spawn of a demon is despised by mortal and immortal alike, not knowing
the truth is the only thing keeping her safe.

Forced to flee her home in the wake of disaster and discovery of who
she is, Airie must place her trust in a man who believes she should
never have been born. And when a demon uprising threatens lives he has
sworn to protect, Hunter has to make a choice: abandon Airie to an
uncertain fate, or overcome his own personal demons and love her for
who she truly is.