BOOK REVIEW- UNDETECTED by Dee Henderson

Commander Mark Bishop is deliberately low-key: "I'm in the Navy." But commanding the ballistic missile submarine USS Nevada, keeping her crew trained and alert during ninety-day submerged patrols, and being prepared to launch weapons on valid presidential orders, carries a burden of command like few other jobs in the military. Mark Bishop is a man who accepts that resposibility, and handles it well. And at a time when tensions are escalating around the Pacific Rim, the Navy is glad to have him.

Mark wants someone to come home to after sea patrols. The woman he has in mind is young, with a lovely smile, and verysmart. She's a civilian, yet she understands the U.S. Navy culture. And he has a strong sense that life with her would never be boring. But she may be too deep in her work to see the potential in a relationship with him.

Gina Gray would love to be married. She has always envisioned her life that way. A breakup she didn't see coming, though, has her focusing all her attention on what she does best--ocean science research. She's on the cusp of a major breakthrough, and she needs Mark Bishop's perspective and help. Because what she told the Navy she's figured out is only the beginning. If she's right, submarine warfare is about to enter a new and dangerous chapter. AMAZON 4 STARS

I liked it but also with some reservations. In some ways it was a bit of a mixed bag for me.   It's clear that the author did her homework when it came to the Navy, submarines and the sea patrols.  But for me it was a little too heavy with some of those Naval details. I probably would have liked it even better if some of that had been dialed back a bit.  It was a good look though into how tough it is for those out on patrol for months; both those serving and those waiting for their return. That was pretty well done in my opinion.  

Gina was quite the surprise both with her genius and her flaws.  Her occasional speech freeze was something unique and I liked how people supported her and helped her when it happened.  
She went from hoping for one man who would be seriously interested in her to later having two men who were .  It presented a whole lot of challenges.  But I liked how honorably both men dealt with each other as they tried to win her heart.  

Mark was older, had been married before; he was a widower with a past really good marriage beneath his belt.   And he wanted it again; he saw who Gina really was but it took him awhile to realize they COULD be a team.  A really good one, Another plus was that he was an man who was active in his faith as was Gina.  God plays an integral part in this story, but I think that fact is a well written strand that adds to it. 
There are also some good supporting people in the story as well.  

Things do become heated and intense when clashes start happening internationally.  And it places both Mark and Gina's brother, Jeff right in the middle of it.  Will Gina's scientific discoveries help or not come in time?  You can feel the tension of those questions.