Sea of Shadows by Jeff Edwards, free PDF

[AnemicOak]

The author is offering the book as a free PDF on his website (Kindle version is $7.99)...
http://www.navythriller.com/downloads.htm


Description...

THE ONLY WAY TO SURVIVE IS TO CHANGE THE RULES.

A minor accident at a German nuclear power plant, a Biological Warfare attack on the British Embassy in Washington, DC, and a secret arms deal combine to drive a trusted NATO Ally into an illegal alliance with a rogue Middle Eastern state. With the world hovering on the brink of war, a handful of U.S. Navy warships must track down and destroy a wolfpack of state-of-the-art submarines.

Their enemy is skilled in deception, and incredibly lethal. Out-gunned, out-maneuvered, and out-thought, the U.S. Navy crews must throw the rulebook out the window, and become every bit as devious and deadly as their enemy. If they fail, the consequences are unthinkable…

(Originally published as "TORPEDO")

...there's also a very basic free game that might interest some folks.