Seth

Seth: Futuristic Spy Romance (Cyborgs: More Than Machines) - Eve Langlais

It's been awhile since I've read Aramus's book, but if memory serves, some of this overlaps with that book. Seth was married (and still is) to Anastasia. They have a long history together (were recruits together and later were "chosen" for the "enhancement" program). What led to their breakup was a huge "misunderstanding," orchestrated by the military.
While this is about Anastasia and Seth, I thought some the the underlying story-lines were further explored and will come to fruition in the next 2 books in this series. (Who is the company? Who is really in charge? Where did the nanos come from? An alien life form?). Adam's book promises to pick up where this one left off.