Lexie,

The survivors of what has come to be known as The Catskill Cataclysm are not out the woods yet. As the last known members of The Hidden, they are marked for extermination. Their allies—Chan and Danni, and the Troika—are hunting them as well, but the Hidden do what they do best: hide. Something new surfaces in the South Atlantic: a Manhattan-size iceberg. And embedded within it is a long lost Nazi U-boat. Back in the day, the Third Reich claimed part of Antarctica for its own. Was the sub on an exploratory mission? It carried a strange artifact that it was ferrying home when it was trapped in the ice. The bodies of the crew are perfectly preserved from the subzero temperatures… but they all were murdered. Could the appearance of the sub have any relationship to the Catskill Cataclysm? Unlikely. But then, there are no coincidences.