I loved the first one, "Carved in Darkness" from 2013 and this one was equally good although this 2015 book says it is #3 and "Sacrificial Muse" from 2014 is #2.
Awesome assassin, Michael O'Shea has been trying his best to keep his secret love, policewoman Sabrina Vaughn, out of his cold-blooded employer's hands and when he finds out that his friend, partner and boss's son, Ben Shaw, handed her over to his sociopath father to be one of his sleeper agents, Michael is really pissed. But when a young boy's body is dumped on her turf, Ben and Michael are sent to find out if it impacts one of their clients. The twists, turns and double crosses are excellently developed and so convoluted and it is far into the book before the pieces start to come together. It kept me guessing all the way to the end as to who Michael and Sabrina could really trust.
There is a lot of violence, gore and body parts here so if you are squeamish, be prepared. Sabrina is definitely not a damsel-in-distress and being unable to keep her safe is driving Michael even more distraught. They both have darkness in them, scars upon their bodies and their pasts were equally gruesome and painful to contemplate, so they really do deserve some happiness; but you have to wonder, with these characters happy there might be no more sequels. So I can go either way on that, I want more, but I want them happy too and it doesn't look like I'm going to get both.
Beaumont lives in Phoenix which is only a short jaunt away from Prescott so maybe I will send her a note (in a totally librarian, not stalker-y way) that says I love these, keep writing them and I will keep reading and recommending them to everyone I know.