I enjoy books that don't stick religiously to one genre, and this one sounded like it had a bit of everything. And indeed it does--some sci-fi, some mystery, some thriller, some romance, and a pair of interesting characters who reminded me a lot of The Girl With The Dragon Tattoo.
It's mostly mystery, though--two mismatched heroes thrown together by chance, stuck on a dangerous space station trying to solve the same crime for different reasons, not knowing whether they can trust each other but being forced to try. The mystery's deftly handed, and there are some exciting action sequences too.
I would have preferred a bit more sci-fi--the action mostly takes place on a single space station, and I'd have preferred to see a bit more of the author's futuristic world, because there are some interesting hints and ideas dropped about it without you ever really seeing it first-hand. However, judging from the ending (which I won't spoil for you), I get the idea that there's a lot more of the world to be revealed in the sequel, so maybe the author's just biding her time.
The best part of the book is definitely the two heroes, though. Rafe and Kama are really interesting characters with a lot of surprising skeletons in their closets and I really enjoyed seeing them battle against their demons throughout the book. It was an enjoyable read and the sort of story that could make a really interesting movie.