"Lost in Pelucidar, Part Two"
Tarzan finds himself captured by a tribe of men at the Earth's core. Luckily it puts him in contact with Thoar's sister, Jana. With luck, this may lead him to his friend Jason Gridley.
Meru finds that she has gained strange powers when she is stung by a large wasp. Now she has the ability to search for her friend Kasla.
This book also contains a text story titled "More trouble with Dalu" and a re-occuring short called "DINOSAURIA", which chronicles information about the Plesiosaur.