Stephen Coonts' Deep Black: Sea of Terror

Two massive ships are on a dual path to destruction. One is a freighter carrying nuclear materials to Japan; the other, a cruise ship heading for the Mediterranean. Neither will reach their destinations. Two factions—Japanese eco-terrorists and Middle East extremists—have joined forces to infiltrate the ships, incapacitate the crew, and change course toward a common target: The United States of America. In Washington, Charlie Dean and a team of commandos are dispatched on a life-or-death mission