Bloodshot - Cherie Priest
I loved Raylene's snarky, sarcastic type of humor. The secondary characters are fun too; Domino and his sister Pepper, Sister Rose/Adrian, Ian, Cal, Horace. They all play off of each other well (leading to some funny commentary).
The story is mostly resolved, Raylene just needs to find a certain individual now (and maybe a certain someone's sister too). Hopefully, that happens in the next (and the last) book.