22 - Brood of the Dark Moon by Charles Willard Diffin

Join Chet, Walt, and Diane as they embark on a thrilling journey to the Dark Moon, but this time they find themselves as captives of their formidable foe, Schwartzmann. Will they escape his clutches and uncover the secrets that lie in the shadows? Prepare for an adventure filled with danger and intrigue! (Summary by Charles Diffin)