Realms of Ruin: A Forbidden Love Fantasy Romance (Astrals and Nokts Book 1) by Nika McKinney

Childhood friends separated across enemy lines. A brooding rebel leader and a spy who should know better. She's his Ruin. He's her rebellion. As the king’s most elite ice-wielding spy, Ruin Vespera thrives on retribution. The loss of her parents and her closest friend have forged a shield around her heart, caging her in from her deepest desires. Raised to be enemies, her singular focus is to hunt down the rebellion general, Dominus Zarek, the greatest threat to her realm. Yet when she meets him, he’s not who they said he was. He’s protective, powerful, and alluring. The general forces her to reexamine the world she thought she knew when a drastic bargain unravels the truth behind the darkness. And the monsters she uncovers won’t let her go without a fight. Dominus is the one man she’s meant to kill. He’s the one man with the power to melt the ice around her heart. Yet with every day that passes, their alliance, like the veil over the land, deepens. But to choose each other, they'll have to betray everything they've ever fought for. Read more