A quartet of seafarers uncovers a mysterious copper cylinder holding Adam More's account of shipwreck and discovery in the southern hemisphere. As they recount his extraordinary tale, readers journey alongside him through subterranean passages into a hidden realm beneath a volcano—a utopian world where prehistoric creatures roam and conventional values are inverted. Here, obscurity trumps prosperity and scarcity is celebrated as virtue, offering a stark counterpoint to Victorian society. Part philosophical satire, part pioneering science fiction, James De Mille's visionary novel continues to captivate modern audiences and restore the author's legacy as a visionary thinker.