Tarzan and the Jewels of Opar , the fifth work in the Tarzan series, was published in 1918 and features a return to the city of Opar and its priestess, La. After having lost his fortune, Tarzan sets out to loot some of the riches of the ancient city of Opar. This results in his wife, Jane, falling into the hands of slavers and a renegade Belgian officer, which leads Tarzan into further conflict with both man and beast.