I'll start off by saying that I gave this 4 stars because I found it enjoyable to read and because this site doesn't allow me to give it 3 1/2 and 3 seemed a bit harsh though maybe closer to the reality. That said, there are some problems with this book. The sentence structure is awkward in much of the book. OK, no one reads erotica for great literature but this could do with an editor who understands grammar and sentence structure. It's not horrible but it's awkward and that would be an easy fix. What happened to editors anyway? They don't seem to exist anymore. 
 There was something that irked me at the beginning but thankfully it was never repeated. Pre-mortem. No. That is not a word. Postmortem. Antemortem. Perimortem. A cop should know this and I hope if the author does an edit of this book that he fixes that one, it's right in the beginning and it really made me cringe. This is the trouble that I think any writer would encounter who doesn't have the resources to speak directly with a police officer or homicide detective in order to research their book and keep it realistic. There are some problems here as well. The biggest one (and I promise to not give any spoilers) is how obvious the killer is and how determined Gavin is to ignore it. I mean, neon flashing sign, obvious. But Gavin doesn't seem to have any cop instincts for a seasoned detective. This bothered me a lot and it made the book frustrating. That and well the whole set up because in the real world his insertion of himself into the case would really hinder any prosecution if/when an arrest was made. Due to his personal involvement with the club/people in the case, it would make any of his testimony highly suspect and would likely get him fired or at least busted down from detective. 
 Like I said, however, I really did enjoy this book. Gavin and Ben are extremely likeable characters (even if Gavin does come across as a bit of a dummy). I really enjoyed Gavin's family and especially his brother Cole. AJ Rose has done a lot of things right here and it makes up for the problems even if I was yelling "Why are you being so stupid?!" at the book at one point. But I wanted to keep reading and that's the key and that's why I gave this 4 stars. I wanted to know how it would end. I wanted to cheer Ben and Gavin on in their relationship. I think AJ Rose has done a wonderful job with that part of the book and with opening the door to the BDSM world for any readers who may be unfamiliar with it. 
 The sex scenes are explicit and steamy (and let's be honest, that's why you're considering reading this book). The awkward sentence structure is not a deterrent but the not very good at his job detective might be. If you're a fan of this genre and want a quick and easy read and are willing to suspend your disbelief that Gavin is any kind of cop, give it a shot. If you're looking for substance and literature or a good crime story, maybe give this one a miss. 
 Warning, for those who may require it, there are some non-consensual violent acts in this book. You're reading an erotic story but it's also a crime story and you should keep that in mind. Also, of course, contains elements of BDSM. Why are you even considering reading a book with a photo of a guy tied up on the cover if you're bothered by kink? ;)