A fascinating novel of the adventures of Lieutenant Bliss Eppley of the United States Navy, in his quest for the people who once lived and prospered in Greenland, who later disappeared without a trace. He believes these Norsemen have traveled to an unknown land near the North Pole that is warmed by volcanic activity and wants to use the United States dirigible, the Z R-5, to track them down and claim this land for America. The Z R-5 is to be a participant in an international dirigible race over the North Pole to establish polar trade rights, and our hero does everything within his power to use the dirigible to find the lost land he dreams of. Will he find this lost land? Will the Z R-5 win the dirigible race? You will only find out by reading on.