The #1 New York Times bestselling author teams up once again with her Edgar award-winning son to bring us a new heart-pounding thriller involving the search for a mysterious Atlantean city While mapping the ancient underwater city of Marinth in the Atlantic Ocean, submersible designer Hannah Bryson makes a shocking discovery: she may have finally uncovered the truth about the once-glorious city’s mysterious demise. Long ago it was a thriving metropolis bursting with culture and life—Marinth’s sudden disappearance has plagued scientists for years. But now, with her unexpected new findings, Hannah realizes that the ancient city’s explosive secret could have dire consequences for the modern-day world. But Hannah isn’t the only one who realizes it.
