This was a very fun book to read and one I'd be more than comfortable recommending to fans of Jake Grafton. There is a bit of a pattern emerging in the most recent Jake Grafton novels, rather than behaving as a flag officer of the US Navy is expected to, Admiral Grafton keeps getting thrown into situations more appropriate for a State Department or an intelligence agency employee. That being said, Mr. Coonts has been really consistent with Jake Grafton as an individual, what drives him and how he acts are known commodities at this point. There are even a few pet descriptions of Admiral Grafton at this point which could be plotted on a Jake Grafton bingo board for each book.
This particular book had Admiral Grafton assigned to a international task force for a Space Defense satellite and then assigned by the Secretary of the Navy, his old flying mate Flap Le Beau, to track down a stolen US submarine. The description sounds outlandish, but actually was easy to swallow once all of those involved were introduced and the situation was made clear. In terms of readability, this one was easy to get through and the story kept my attention from start to finish.
One thing I really like about the Jake Grafton series is how Jake often adopts people into his trusted circle. The series didn't start with a team or group supporting Jake, but has stretched from Vietnam to the early 2000s (as of this novel's timeline). Throughout his career, Jake has run into characters due to a variety of circumstances. Some, like Toad Tarkington, are now a fixed part of each book. It seems like Tommy Carmellini is soon to join the "every book" team. Old characters sometime reappear, like Flap in this book, and exit again. It makes investing in the characters of each book worth it as you never know when one of them may make their way back into the narrative. It feels very natural, just as one would expect from anything spanning decades.