It's fleet week in New York City--but there are hungrey sharks swimming among the welcomed guests... As thousands of foreign ships clog the great city's harbor, beneath the surface of the Hudson River a rogue armada of Chinese attack submarines is taking up position, ready to launch a blitzkrieg attack on the unprepared and unsuspecting populace. Tugboat captain Ken Hughes knows New York harbor as few other navigators do. Now, in the midst of chaos and terror-on a familiar waterway that has suddenly turned hostile and deadlyhe finds himself on the front lines of the baffle to free a hostage Manhattan. Time is running out for a city under siege as Hughes, sailing enthusiast Kate Ross, and a courageous handful of desperate citizens race to prevent an explosive destiny that could paralyze a nation and reduce an island metropolis to rubble.