The four stories collected in this book were written by two sons and a daughter-in-law of Tarzan creator, Edgar Rice Burroughs. John Coleman Burroughs and Jane Ralston Burroughs wrote Hybrid of Horror . John Coleman and his brother Hulbert wrote The Man Without a World , The Lightning Men , and The Bottom of the World . Fully illustrated with the original artwork from the pulp magazines Thrilling Mystery, Thrilling Wonder Stories, and Startling Stories.