A novel by American author Edgar Rice Burroughs, Tarzan and the Jewels
of Opar is the fifth of a 24-book series he wrote on the titular Tarzan.
It was first published in the November and December 1916 issues of
All-Story Cavalier Weekly, and McClurg published the first volume in
1918. In order to make up for some recent financial setbacks, Tarzan
travels back to Opar, the location of a forgotten Atlantean colony and
the source of its wealth. There is a significant cache of gold that was
mined while Atlantis itself was submerged beneath the waves thousands of
years ago, but which is now lost to the memory of the Oparians and only
Tarzan is aware of its hidden position. Tarzan is discreetly followed to
Opar by Albert Werper, a rapacious, outlawed Belgian army commander
working for a crooked Arab. After getting hit on the head by a boulder
that was falling during an earthquake in the treasure room, Tarzan there
loses his memory. She had fallen in love with the apeman during their
first encounter, and La and her high priests are not going to let Tarzan
escape their sacrificial knives this time.