The book begins 1000 meters below the Black Sea. Reed Smith is instructed to sever a Russian communication cable at the bottom of the sea. Suddenly, the Nereus is surrounded by Russian submersibles. Reed Smith is not who he seems to be and cannot be taken alive...but he is captured.
Luke Stone is ordered to rescue the three man crew but things do not go smoothly. This book, like all of the novels by Jack Mars, is unputdownable. The action is fast and furious, but at the same time, a lot of the book is very introspective. We learn a lot about Luke Stone and his family dynamic. I heartily recommend Primary Command and all of Jack Mars' books. I have been reading a lot from him in the last month and I can't get enough. Well done, Mr. Mars.
The wait for Recall Zero (Agent Zero #6) is going to seem very long, even though it is only a few weeks.