Several parts of this book bored me (primarily the parts narrated by Dani, where "feck" or "fecking" was part of every other sentence, and the parts with Sidhe Seers and their politics), and cliffhanger endings suck. Thus the 3.5 stars rating. 
 Apart from that, world building, lore, atmosphere, dialogues and character writing were fantastic. 
 Never read anything like it. 
 Now, I will simply leave you with a few impressions of Dreamfever's writing in the form of quotes to see for yourself, and jump right into the 5th book. 
 "What few newspapers were left on the stands were dated October 31, the last day Dublin had functioned. 
 The city had fallen that night and never gotten back up. Storefronts were bashed in, windows broken out. 
 There was glass everywhere, cars abandoned, some on their sides, others burned. 
 The worst part of it was the dried husks-- I quit counting after a while-- blowing down the streets, tumbleweeds of human remains, that part of us that Shades find indigestible." 
 "I have a black sense of humor. You try living my life, see what color yours turns." 
 "Bring it on, Tinker Bell." 
 "So what's the big picture about our lust for sex? 
 We're not trying to acquire something. We want to feel something: Alive. Electrically, intensely, blazingly alive. Good. Bad. Pleasure. Pain. Bring it on--all of it. 
 For people who live small, I guess enough of that can be found in sex. 
 But for those of us who live large, the most alive we ever feel is when we're punching air with a fist, uncurling our middle finger with a cool smile, and flipping Death the big old bird."