His dog. His computer. The tunnels under New York City.That's all Joe Tesla's agoraphobia has left him with-the inside world, the dark world-and now the black depths of the sea. In the latest book in this award-winning thriller series, Joe Tesla ventures out into the ocean depths in an underwater scavenger hunt. The competition turns deadly when a mystery sub rams Joe's and leaves him for dead on the ocean floor. Joe survives and his search...