<P>While mapping the ancient underwater city of Marinth in the Atlantic Ocean, submersible designer Hannah Bryson makes a shocking discovery: she may have uncovered the truth about the once-glorious city's mysterious demise. The only problem is that Hannah's findings could bring to light an explosive secret that would certainly have dire consequences for the modern world.</P><P>Unfortunately, Hannah isn't the only one who recognizes the potential for evil here. When her key artifact is hijacked en route to a research lab, she is thrust into an adventure in which she must match wits against a terrible enemy who won't hesitate to kill anyone who stands in his way. With her life in imminent danger, Hannah's best hope lies with Kirov, a deadly man from her past. Together they race to unravel Marinth's last great secret in order to prevent a catastrophe of global proportions.</P>