09 - Moon Master by Charles Willard Diffin

In a thrilling journey through the vastness of space, join Jerry Foster as he hurtles toward the Moon, only to find himself ensnared by a brutal civilization that worships a nightmarish deity. Faced with the horrifying prospect of being offered as a living sacrifice to Oong, their mesmerizing yet repulsive god, Jerry must summon all his courage to survive. (Summary by Charles W. Diffin)