While on my action series kick, I picked this one up thinking it would be more of a slow burn. Not sure where I got that idea, but I was way off on that one. They're instantly attracted to each other, and it doesn't take long before they're acting on that attraction, forbidden by company policy or not. 
 This is quite an interesting universe. It bears some resemblance to Andrea Speed's Infected universe, in that something happened planetwide to cause animal shifters to exist, and they are integrated with--though not necessarily accepted by--the public. They're supposed to be registered to be hireable, but of course there are many who don't want to be registered for some reason or another. There are various kinds of animal shifters: bear, dog/wolf, cat, etc. A big difference in the universes is that these shifters can retain their Humanity in their shifted form, assuming they don't stay shifted for an extended period of time. 
 And there is a "police" force specific to crimes and enforcement of these Therian shifters--THIRDS. One of the MCs (Sloane) is a team leader for a unit within THIRDS, and the other (Dex) was a homicide detective with the Human Police Force (HPF) who testifies against his human partner (for unjustly killing a Therian informant) and is pushed out of the HPF by the bureacracy and the department/coworkers he'd been working with for ten years because he turned on his partner. (He's quite unpopular for a while.) So Dex is "promoted" to Sloane's unit in THIRDS, because there's an opening--Sloane's partner had been killed over a year earlier, and he hadn't found (or wanted) a new partner, though THIRDS had paired him with several others that "didn't fit". And though it takes a while, Dex manages to charm the team into (mostly) accepting him. 
 Dex is quirky. He LOVES 80s music and drives a muscle car. He's got a sunny disposition and a sharp wit that instantly drives Sloane (and one of the other Therian team members, Ash) batty. But as much as Dex annoys him, Sloane finds himself smiling at Dex's antics just as often. Despite the rocky start with the team, Dex proves himself to be intelligent and a good asset, particularly in sticky situations. 
 The main crux of the story is the case Sloane's unit is working on: several Therian sympathizers have been recently killed, and it looks like it was done by a Therian, though the clues aren't adding up like they should. The case keeps opening up figurative old wounds for Sloane, which jeopardizes the tentative friendship(-with-benefits?) with his new partner because of secrets surrounding his old partner. 
 Sloane has a LOT of secrets, and we don't know what all of them are yet. His past before he joined THIRDS is the biggest one, and only Ash knows that. Sloane has a lot of personal trauma to overcome, but by the end of the story, he's beginning to trust Dex--not with everything, but with his heart, at least. 
 If I have any beef with this book, it's the proofreading. The comma issues and a few typos just repeatedly pulled me out and drove me bonkers. I'm sure a lot of readers won't notice most of them (any more than the proofreaders did), but I couldn't help but note them as glaring mistakes. It loses at least half a star for that. 
 This is definitely the beginning of a series. It is not resolved by the end, so you'll likely want to move on to the next story immediately. I'm looking forward to it.