Edgar Rice Burroughs provides one of his most interesting combinations of adventure and social commentary. The premise behind this alternative history story is that the United States did not get involved in the "Great War" in Europe but instead followed its isolationist tendencies to such an extreme ("The East for the East...The West for the West") that no one from the United States has gone past 30 degrees or 175 degrees latitude for over 160 years, which means no one in America even knows who won the war. It is now 2137 and a raging storm has thrown the Pan-American aero-submarine "Coldwater" past the 30 degree mark. The damaged vessel under the command of Lt. Jefferson Turck lands in England and German helmet and Felis tigers. In time, the crew will discover what happened to "The Lost Continent" of the Old World. Of course, since this is a ERB novel we know that there will be a damsel in distress for Lt. Turck to save from the great evils that he finds in the Europe that has slipped back into barbarism the way it did after the fall of the Roman Empire.