The Tombs of Anak (The Cooper Kids Adventure Series #3)

Jay and Lila Cooper are back for another adventure, this time in search of a young treasure-seeker whose ambitions drove him to the bottom of a pit, never to return. In their struggle to understand what happened to him, the Coopers learn of a greedy, man-eating creature known as Ha-Raphah, who terrorizes locals into worshiping him. Although they are certain he is extremely dangerous, Jay and Lila are determined to uncover the truth.