Tarzan and the Well of Slaves

Endless Quest #26 From back of book: You have followed the trail of strangely clad figures with their leashed leopards deep into unexplored mountain country in the hope they will lead you to the answer behind the disappearances amoung your loyal Waziri followers. But nothing has prepared you for what you now see as you stand atop a ridge high above the valley spread below you. For beneath you lies a magnificent city where none should be, a replica of those built by the Pharaohs four thousand years ago! And suddenly you know the answer to your quest lies within its ancient, mysterious walls! You are Tarzan of the Apes, and the choices are yours in an ENDLESS QUEST Book.