Savage Pellucidar
Edgar Rice Burroughs
 'The Return to Pellucidar'. David Innes goes for a war and becomes a POW again, while Abner Perry makes a balloon, which escapes with Dian the Beautiful in it. 'Men of the Bronze Age'. Dian meets the people who have advanced to bronze age and is made a goddess. 'Tiger Girl'. David Innes goes after Dian in another balloon, he plays the role of a god. 'Savage Pellucidar'. Two separate search parties are looking for the lost ones without knowing the other has already found the ones they are seeking.