The Darkness Beyond by Alexis Morgan

I really really love Alexis Morgan's Paladins. They're strong silent types (except that they're not so silent with each other -- they yell, throw things, have temper tantrums and brawls...) who protect our world from the crazed Kalithians who attempt to cross over a barrier between their dimension and our own that exists  deep in caves along the faultlines of the Earth. (Not that all the Kalithians are crazed, but the bulk of the ones who try to cross the barrier are.) Kalith is a dying planet. And apparently, the Paladins share some DNA with them. They're warriors, and they're always male. And just to make it *that* much better, they can, for an indefinite period of time, come back to life after being killed -- although each death and resuscitation (resurrection?) takes something out of them, and eventually they go crazy and have to be killed.
D.J. Clayborne is a Paladin and a computer genius/hacker who is *famous* in the cyberworld as the hacker Knightwalker. Regina (Reggie) Morrison works for a company that is hired by other companies to track hackers. She's been tracking Knightwalker anyway because she's curious and can't resist a challenge, but lately, her company was actually hired to find him. Part of her's reluctant to admit that she's found him, because she enjoys their little game of barb-and-prod, cat-and-mouse. But on a side trip while trying to confirm details, she accidentally stumbles into the system of the Regents, who manage and fund the Paladins, and finds, downloads and prints a history of the Paladins. Also, I should mention there's been some internal unrest in the management levels between the Regents and the Paladins (security, finance, medical...all that fun stuff).
I'm gonna stop there because I tend to get all involved in synopsis stuff and don't want to tell the bare bones of the story in under six paragraphs.
Ms. Morgan has managed to write a series that is just as interesting and compelling in the 8th book as it was in the first, or the fourth (which is actually where I first picked up the series and started glomming. Seriously glommable.) We get some time with past characters, and just enough of some new and interesting ones, and some of the bad guys too--but just enough that we know a little about where things are going rather than so much that we begin to wonder just who the series is about. But the primary focus of the book is D.J. and Reggie. They get moments of fear and joy, anger and love. And, of course, the bad guys get got. Spectacularly. AND we get a new Paladin out of the whole thing--Reggie's friend and coworker Cory, who grew up in the foster system and always amazed and freaked out his foster parents with his amazing healing abilities and crazy energy and metabolism.
I just can't wait to see who's next of the Paladins to get his HEA!!