Led by ex-navy SEAL Mike Chambers, the Trident Force is the blackest of the black ops. Their specialty: fighting the war on terror at sea. Handpicked for their skills above and below the waterline, they do the jobs no one else can handle—and the jobs no one else could survive.

The Aurora Australis is the ultimate luxury cruise ship, and it has become the ultimate target. Loaded with politicians, celebrities and international jet-setters, the Australis is touring the Antarctic as part of an environmental summit. But global warming takes a back seat when a more immediate threat emerges: terrorists threaten to sink the ship. Now, the Trident Force must infiltrate before the plot ends in the dark freezing deep.