This is 3.5 stars. I both loved and hated this book. Loved it too much to give it 3 stars but hated it too much to give it 4 ... so it's 3.5 
 Pros: 
 - I genuinely like Ty and Zane as characters. They're a bit ridiculously overloaded with backstory and for some reason all of that backstory had to be handled in THIS BOOK, but still they are fun snarky macho characters. 
 - I also found myself really really wanting them to screw and then getting all hot and flustered when they did. 
 -Seriously the sexy bits of this book are A+ I love interesting power dynamics, I love tightly written lustful affection, and hate sex is the hottest thing on the planet to me. So naturally for me the sex scenes were totally worth the price of admission 
 - The connecting factor in the murders was actually pretty interesting and unexpected. Up until the reveal I figured the patterns behind the killing would be they were all people Ty had one night stands with hahahah. 
 - While many of the attempts at clever banter came off rather childish and one dimensional. There were also some moments where the authors got it right. I laughed out loud more than a few times and the bit about the nightlight in the end was just so adorable and endearing 
 - The book is PLOT driven and the plot actually isn't hastily constructed to facilitate the sex. Of course the plot is also completely divorced from reality as far as what police procedure is, but what the hell this ain't fucking Law and Order 
 Cons: 
 - This book was so obviously written tandem. Most of it reads like a RP chat log. It gets better after the first third, but not by much. Ty and Zane have so many scenes that get derailed by poor communication between the writers. The narration comes of jerky, confusing and contrived. If this was a RP that would be one thing, but in professional publishing there's this little thing called THE SECOND DRAFT. You know that point after you've figured everything out with your cowriter and can go back through and tighten everything up, add some nice transitions and stuff? These guys clearly skipped that. 
 - All through this book you have pointless signaling sentences. The equivalent of saying 'No no I want your character to come over and do THIS!' The narrator would reveal that Ty was upset and confused by Zane's comments and wished they could just fuck and ~SUDDENLY~ Zane would do a 180 and grab Ty for a kiss. This sort of stuff is super annoying because it makes these characters seem like they can read each other's minds. Plus I don't want the author(s) to define feelings for me, I want to be allowed to infer, to create my own impressions of the characters that I can play with in my head as I read. That what makes reading fun and suspenseful. 
 - I knew who the killer was the moment his character was introduced. I'm not joking. He hadn't even DONE ANYTHING. He hadn't spoken a single word. Am I psychic? Sadly no (view spoiler)[minor characters get shafted in this book: no physical descriptions, no hair color, no eye color, no distinguishing characteristics of any kind, certainly no character development. So when a minor character shows up and gets a description you know something is up. First thought was: Oh, and here's the killer (hide spoiler)] 
 - If I had a penny for every time Ty 'cocked his head' I'd have a full refund for the price of the book. Just saying.