Ash and Iron - Lisa Llamrei

Lily Brown should have died in the fire. Instead, she commanded it.

Suddenly thrust into a hidden world of witches and centuries-old grudges, Lily learns she's the heir to the first witch burned in 1586-and possibly the one destined to end a brutal curse that forces witches and hunters to kill one another.

Ryker Cruz, a hunter by blood and fate, should want her dead. But when shadow creatures begin targeting both sides, he and Lily are forced into an uneasy truce that burns hotter than the fire between them.

As they chase the truth across Europe, enemies become reluctant allies... and something perilously close to more.

But the deeper they dig, the clearer it becomes:
The greatest threat isn't the curse that binds them. It's the secret power determined to control it.