Tom Sparks is a simple and honest engineer who is unwittingly thrust into a wild adventure when a series of unusual earthquakes threaten his subterranean home of “Under Passage”. There are strange happenings deep beneath the planet’s crust, and Tom must journey through mysterious and fantastical worlds in order solve the mystery of the Quakes of Ruin. There are many interesting creatures and civilizations that have settled underground since the surface world froze over, and indeed many of these subterranean inhabitants are compelled by evil to try and halt Tom’s quest! Luckily, our brave protagonist is a skilled technician and a thrifty inventor. He will need those skills in order to build himself an arsenal of weaponry and tools to survive the coming trials.