Someone has sneaked into the caves of the wyverns - the last descendants of dragons in the West, and this is a gross violation of the agreement that people and dragons entered into many years ago. Nathaniel and his Aunt Phil must find the culprit before the dragons take revenge. But getting into the caves is not so easy; there are intricate tunnels leading there. Plus, it seems someone is stalking Nathaniel. Meeting an enemy in the dark under a thick layer of rocks... Brr! You wouldn't wish it on anyone! But the brave boy is ready to defend himself, his aunt and even, if necessary, the dragon!