This book was very nearly a DNF for me. It was dull, the leaps in logic were incredible, the heroes were nearly identical in personality without a hint of swoon-worthiness, and the ending was a series of dragged-out conversations with what was meant to be a cliffhanger tacked onto the end.
In short, this book is about a heroine who was so typical urban fantasy heroine that I can't even remember her name now (and I just finished it). Her parents are dead, she's a pseudo-witty jackass to dangerous creatures, she's described as "damaged," people love her even though she's not vaguely lovable... you get the picture. Her job is to clean up supernatural-related crime so that the police don't catch on. Naturally, the police do catch on--actually, one officer in particular, who we shall call Officer Friendly, because Officer Limp Rag would be rude.
Officer Friendly forces Heroine to give him fifty pages of awkward exposition on the milieu, and they agree to work the case out together. There's something-something-something about the werewolf that is madly in love with Heroine after having been used by her for sex three whole times, something-something-something about silver, and LOTS of something-something-something about evolution which we don't need to know.
Anyway, it all boils down to the heroine's vampire employer threatening her in a weak attempt to add tension to the story, although she's not so worried about it that she doesn't take plenty of breaks to sleep and hang out and share more expository dialogue. We do learn that she has a somewhat interesting back story at some point, which was one of the redeeming points of the novel, and I wonder why that wasn't an actual part of the plot instead of mentioned among the fifty pages of exposition we have to tolerate during the meat of the book.
Have you seen the old Batman movie with Adam West? How they decide that Catwoman must be involved, because the criminals are at sea? "Sea... C! For Catwoman!" That's pretty much how they end up determining who the bad guy must be in this book. "This is the tenth anniversary of this crime that happened that we showed for no reason at the beginning of the book and haven't mentioned since... OH MY GOSH the perpetrator must be the victim's brother!"
None of this would be a big deal if the story was exciting, or if I could get excited about the characters, but it was all pretty bland and low-tension. UF is a flawed genre, but vibrant worlds, eccentric characters, and interesting relationships make up for it. UF is usually unbridled fun. All of that is absent here.
Mostly, I think I'm only so disappointed in this book because the concept of a "null" (someone who turns supernatural creatures human when she's in the vicinity) is so damn interesting, and I one-clicked the heck out of it based on that premise alone. Think of all the trouble you can get into with a null! But the heroine is passive and reactive and everyone around her drives the plot. She's just along for the ride. Man, what a waste of a fun power.
I suspect that a lot of the major problems with this book were editorial decisions on the part of 47North rather than the author, though; the lengthy, LENGTHY segments of exposition were most likely forced on Olson by editors who thought that people needed to know that evolution produced werewolves, vampires, and witches, or else they would be too confused. Here's a hint, editors: the world in this book is so derivative of every single vampire/werewolf/witch book out there that nobody, and I mean nobody, will be confused by it.
That said, this is the author's debut novel, and I might pick up a sequel. Fuck me, but I do love urban fantasy, even when the poor attempts at noirish plots and inexplicably irresistible heroines drive me up the wall. Fingers crossed that the sequel will skip all the exposition. The tacked-on cliffhanger also suggests a much more personal plot for the followup that might spur Heroine into taking charge of her life, which is promising.
I tentatively recommend this to UF genre fans, as long as you don't mind the weaksauce "romance" and poorly-structured procedural elements.