Notes
A Grenfell and Wright novel.

Publisher’s Blurb – Dust Jacket Flap
When Jock Grenfell and Noel Wright, motor-cycling peacefully along a lonely Sussex lane, broke down and called at a nearby house for water, they could not possibly tell that they were on the eve of the strangest adventure of their lives. A journey to the Moon, in a giant space-ship capable of travelling at over ten miles a second!

It sounded far-fetched enough, but Professor Quinn and Dr. Sorrell, the two kindly, absent-minded old scientists who had spent twenty years planning the voyage, seemed confident that it could be done. "The rocket will hold four," Sorrell told the boys, "and if you want to join us we are prepared to take you."

Neither Jock nor Noel felt inclined to miss such a chance, but had they known of the dangers that awaited them in the shadowy, blue-lit lunar caverns even their courage might have failed them. A fantastic underground world – a shining lake – chirping, death-dealing spiders! It did not take the four friends long to find out that there was no safety for them in such a world, but their greatest ordeal came when they were captured by the hideous green people of the caverns, and found themselves fighting not only to save their own lives, but to check the ruthless ambition of the mad genius who styled himself "Master of the Moon" . . .