A confrontation between a radical environmentalist group and a Danish cruiser leave many survivors trapped inside a sunken ship. But when the head of NUMA Special Assignments, Kurt Austin, and his colleague, Joe Zavala, are enlisted to run the rescue operation, they uncover a far more sinister agenda on the part of the supposed environmental group. Their agency, Sentinels of the Sea, is connected to a shadowy multinational corporation with plans for controlling the world’s oceans. And somebody within the company is willing to kill anyone who gets in the way.