An unknown enemy wreaks havoc in the South China Sea while blaming the destruction on Jonah Blackwell and the crew of the  Scorpion,  forcing them to untangle a deadly conspiracy  rooted in a lost technology from World War II.   May 6, 1945:  A German submarine U-3531 disappears en route to mainland Japan, taking with her a weapon that could have changed the course of the war.   Present day:  Salvage diver turned submarine captain Jonah Blackwell and his unproven crew resurface on a mission of mercy, secreting starving refugees from the brutal North Korean regime as a hundred-year winter ravages the northern Pacific....