Heidi Hart

I don't even know how to review this book. Everything I can think to say is spoilery, which unfortunately will probably result in a review too vague to be very informative. Luckily, I can't imagine many readers would opt to start the series with FaeFever (book three in a five book series), and if you've read Darkfever and Bloodfever (books one and two), you're probably already hooked. 

Faefever finds Mac still hunting the Sinsar Dubh, the dark book of Fae magic. She learns more about how the book works and how it moves through the city of Dublin. V'lane teaches her more about Fae lore and about how the Queen's consort, the Unseelie King, hungered for power and created the Unseelie race of dark, evil Fae eons ago. Mac begins to cultivate new allegiances -- with a handsome Scotsman descended from Druids, with a superfast, super spunky Sidhe-seer teenager, and with a doggedly persistant human police inspector -- but she still isn't sure she can trust her oldest allegiance, with the mysterious Jericho Barrons. 

Bad, bad, evil things happen in this book (trigger warning). It's dark. It's scary. It's deeply disturbing. Do not even start Faefever unless you have book four, Dreamfever, on hand in reserve, because the cliffhanger ending Will. Slay. You.