Cursebreakers trilogy

Cursebreakers is a series of fantasy novels by young adult literature author Brigid Kemmerer. It consists of A Curse So Dark and Lonely, A Heart So Fierce and Broken, and A Vow So Bold and Deadly.

The series centers around Harper, Rhen and Grey. Harper is girl who gets taken away to the magical world Rhen and Grey belong to, her arrival changing the destiny of their kingdom.