Polar Shift is the sixth NUMA Files novel by the inimitable Clive Cussler. Giant freak waves send an unsinkable cargo ship to the bottom of the Atlantic and a herd of killer whales attack a party of kayakers in the Pacific - random events, or evidence of polar shift? For Kurt Austin of NUMA these two seemingly unconnected incidents are harbingers of a global phenomenon that will mark the end of civilization! A secret organization aiming to bring down the world's elite powers have discovered the means to bring about polar shift - a catastrophic event that will cause earthquakes, lava eruptions, tsunami, electrical disruption and giant whirlpools. Austin knows that he and NUMA cannot fail this time.