Faefever by Karen Marie Moning 

When MacKayla Lane receives a page torn from her dead sister’s journal, she is stunned by Alina’s desperate words. And now MacKayla knows that her sister’s killer is close. But evil is closer. And suddenly the sidhe-seer is on the hunt: For answers. For revenge. And for an ancient book of dark magic so evil that it corrupts anyone who touches it.

Mac’s quest for the Sinsar Dubh takes her into the mean, shape-shifting streets of Dublin, with a suspicious cop on her tail. Forced into a dangerous triangle of… Read more.