First the positive. Lots of sexual tension, some light relief, some darker points. Not the worst book I've ever read but not entirely sure how it ended on the top 5 of several lists in Goodreads, particularly the light-hearted comedy lists. It's a bit short on descriptive settings, the characters are not very deep but believable. So why does it only warrant 2 stars for me? 
 Because it FAN FICTION disguised as a romantic m/m novel. In fact, I'm pretty annoyed that just paid $7.99 for what is in effect J2 fan fiction. The references to Jared Padalecki and Jensen Ackles were so ridiculous that they pulled me out of the story. 
 1) the physical descriptions, i.e. the smaller (but still tall at 6 foot) character Ryan has green eyes, the taller one (at 6ft4 which is exactly Padalecki's height) has brown eyes. And is that Jensen Ackles's torso on the cover?!? 
 2) the names. I stumbled first over Eric Kripke, one of the officers - which is also the Supernatural series creator's name. Ryan's middle name is Ross, just as Ackles's is. Grabowski is Polish, just as Padalecki is. One character is called Bob Beaver, an amalgamate of the character Bobby Singer from Supernatural and Jim Beaver who plays him; 
 3) Family names. Here it just gets ridiculous. Grabowksi ex-wife's name is Sandy, just as Padalecki's ex is. His parents are called Sherry and Gerry, just as Padalecki's are. His siblings are Jeff and Meghan, just as Padalecki's are; 
 4) Not to talk about tropes like calling each other 'bitch' and 'jerk' like - you guessed it - Sam and Dean in Supernatural. Or Grabowski's obsession with gummy bears. 
 I mean, seriously?!? If I want to read fan fiction, I go to AO3 and don't spend money on iTunes!