Tarzan and the Jewels of Opar [Tarzan Series #5]

An amnesic Tarzan has been caught plundering the treasure vaults of the lost city of Opar. But a mysterious treasure hunter and a band of thieves have also learned of the hidden wealth. When a bag of jewels Tarzan had taken falls into the hunter's hands, a game of deadly double- and triple-cross begins--and the winner claims the treasure!