"I will see my father avenged," Matt replied, "or die in the attempt."

Ever since his parents' untimely deaths at the hands of a vicious enemy, Matt Hunter has risked his own life -- and that of his friends -- over and over again. But his team's motivation has changed. As they have grown closer to Creighdor's evil empire, a greater purpose has been revealed: The fate of humankind lies in their hands.

Hunter's League is gearing up for its final confrontation. First, though, they must learn their foe's true nature. It's a discovery with extraordinary implications. And it means one last outrageous journey to the most unlikely of places -- a trip to the bottom of the ocean.