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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. 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.