A Whisper in the Woods by Elise Nelson

Leena and her village had only been settled in the woods for a matter of weeks before the accidents began. They were benign at first, but now people were going missing, and the town matriarch suspects that a monster known as the Leshy is behind the attacks.
To appease the Keeper of the Woods, Leena must be sacrificed.
She thought he was only a legend, a bedtime story to frighten children and keep the real ghouls away. As Leena ventures into the depths of the forest with nothing but her cloak and fiddle in hand, she quickly realizes how wrong she’d been.
As she gets caught up in Bratan’s web, Leena wonders how she can be both afraid of and attracted to such a beast—a monster who could kill her at any moment.
The longer she dwells in the realm of the Leshy, the more she is drawn to him, and soon, she doesn’t know fiction from reality.

All she knows is that she’s playing a dangerous game, and the dice are loaded.