Unusual bubbles near a fisherman's favorite spot. An archaeologist investigating reports of an unexplored tomb. The last-minute search for a student's final book. These disparate events should have been nothing more than footnotes to respective days if not for an unprecedented earthquake centered beneath the lake of Llynbrith.

Forced together by circumstance, or perhaps fate, Gwyn, Jannis, and Licia must explore the shadowed halls carved underneath Llynbrith in the hopes of finding their way back to the surface. It will take all of their cunning, abilities, and a fair amount of luck not only to escape, but perhaps even locate the source of their seismic woes before it threatens the world above!