Back to the Stone Age

by Edgar Rice Burroughs

The fifth installment of Edgar Rice Burroughs's Pellucidar series, "Back to the Stone Age" recounts the strange adventures of Lieutenant von Horst, a member of the original crew that sailed to Pellucidar with Jason Gridley and Tarzan who is left behind in the inner world. Von Horst wanders friendless and alone from one danger to the next.