A Court of Thorns and Roses: Sarah J. Maas

Feyre is a huntress.

She thinks nothing of slaughtering a wolf to capture its prey. But, like all mortals, she fears what lingers mercilessly beyond the forest. And she will learn that taking the life of a magical creature comes at a high price...

Imprisoned in an enchanted court in her enemy's kingdom, Feyre is free to roam but forbidden to escape. Her captor's body bears the scars of fighting, and his face is always masked - but his piercing stare draws her ever closer. As Feyre's feeling for Tamlin begin to burn through every warning she's been told about his kind, an ancient, wicked shadow grows.

Feyre must find a way to break a spell, or lose her heart forever.