Tarzan (book series)

===''Tarzan and the Jewels of Opar'' (1916)===
{{main article|Tarzan and the Jewels of Opar}}
At the end of the previous novel (#4) Tarzan (John Clayton) and Jane's son, Jack a.k.a. Korak, has come into adulthood. John (Tarzan) and Jane Clayton have left London and returned to their Waziri ranch, some distance from Tarzan's original stomping grounds in Africa (where Jack will find them in novel #4).

John Clayton finds that his fortunes have been embezzled, so he decides to return to the lost city of [[Opar (fictional city)|Opar]], where he procured a large supply of gold from their forgotten vaults and reinforced his family fortune (in novel #2).

During this return trip Tarzan is injured in an earthquake and loses all memories of his adult, civilized life and about Jane. [[La (Tarzan)|La]], the high priestess of the Flaming god of Opar, takes advantage of his amnesia.  She had fallen in lust with the ape man during their first encounter. But while La hopes his amnesia opens the door for her lustful advances, her priests are not going to allow Tarzan to escape their sacrificial knives this time. In the meanwhile, Jane is in trouble and wonders what is keeping her husband from coming to her rescue.