K. J. Joyner 
Only the Innocent [EPUB ebook] 

Every spring, the people by the forest hold a festival to celebrate their daughters‘ coming of age. And every spring hunters come from far away to hunt unicorns.
Bette is of age but as a girl of innocence she is kidnapped to be the bait in the next unicorn hunt. She has no idea if she will come out alive or unharmed. The hunters have no idea what is in the forest with them.
Her life and way of thinking will be changed forever.