"The Wolf-Men: A Tale of Amazing Adventure in the Under-World" by David Franklin Powell is one of Powell's lesser-known novels, but it's also one of his most exciting. A man of the wild west, Powell writes about action and adventure. It's the story of imaginative boys as they conduct a lost race about the discovery of an underground world filled with monsters from earth's prehistory, others, such as giant spiders, and a race of vicious subhuman creatures, the wolf-men.