When Jesse McDermitt retires from the Marine Corps, he has no idea what he will do for the rest of his life. At 37, his greatest skill is killing people from up to a mile away. He knows there aren’t many job opportunities in the civilian world for that. However, he knows the south Florida waters, is an experienced diver, loves to fish, and knows his way around a boat.

A waitress in a waterfront restaurant in north Key Largo gives him an idea and he runs with it. An old friend helps get him set up as a charter fishing and dive boat Captain and a new friend helps him buy just the right boat.

Danger lurks in the sleepy little town of Marathon, in the middle of the Florida Keys, as well as in the swamps of the Everglades. But danger doesn’t expect to run into a man like Jesse, who will not only respond swiftly, but with a vengeance unexpected.