Armchair Fiction presents extra large editions of classic science fiction double novels. The first novel is "In Caverns Below" written by veteran science fiction author Stanton A. Coblentz. After mining engineer Frank Comstock was separated from his partner and life-long friend by a sudden cave-in, he was captured by a subterranean group of strange, chalky white people. They were the people of Wu, and though they were scientifically far in advance,...