"Fennwann has no end. It keeps circling back on itself, so it actually goes on forever. Nothing here is fixed and permanent. The whole cave is alive and changing before your eyes. If you think something is still, it is only because you are not looking closely enough."

Mac and his sister Midge are lost in Fennwann cave. There they meet Gilgamesh who becomes their mentor in their quest for some mystical rubies. Together they encounter the most amazing creatures and challenges imaginable. In Fennwan cave nothing is the same from one minute to the next. Every new episode pushes them to their limits of courage and cleverness. Is this real or just a dream? Will they complete their quest? Will they reunite with their parents? Despite dire threats, they press on with confidence and humor. They experience tragedy and triumph, sadness and joy, and learn the meaning of friendship, loyalty, and devotion to each other. The Lost Rubies of Fennwann - an adventure story like no other!