The Departed, young adult paranormal romance (MacKinnon Curse series, book 3)
by Julia Templeton
Riley Williams life hasn’t been the same since she moved to Scotland and met the spirit of Ian MacKinnon, and Laria, the witch who murdered him.
Since helping Ian cross over to the other side, Riley became Laria’s target, and now the witch has made it clear she wants her dead. Laria has already possessed Riley’s brother and friends, and Riley is starting to feel a little strange.