On the bottom of the icy sea off Nantucket lies the battered remains of the Italian luxury liner, Andrea Doria. But few know that within its bowels rests a priceless pre-Columbian antiquity -- a treasure that now holds the key to a puzzle that is costing people their lives. For Kurt Austin, the leader of a courageous National Underwater Marine Agency (NUMA) exploration team, the killing begins when he makes a daring rescue of a beautiful marine archaeologist. The target of a powerful Texas industrialist named Halcon, Nina Kirov was attacked off the coast of Morocco after her discovery of a carved stone head that may prove Christopher Columbus was not the first European to discover America. Soon Kurt and Nina embark on a deadly mission to uncover Halcon's masterful plan -- an insidious scheme that would have him carve out a new nation from the southwest United States and Mexico, and ride to power on a wave of death and destruction. With Austin's elite NUMA crew attacking the murderous conspiracy from different sides, an extraordinary truth emerges: that Columbus may have made a fifth, unknown voyage to America in search of a magnificent treasure. And that the silent, steel hull of the Andrea Doria not only holds the answer to what the explorer may have found -- but the fate of the United States itself.

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