Private Detective Farrell Walker travels to a strange little town in upstate New York for his day in court. He's just there to beat a speeding ticket, but a beautiful stranger persuades him to take on a new case: her younger sister has gone missing. It's soon apparent things are not what they seem. A dark secret lies beneath Devil's Ridge where a mysterious race of hyperboreans have been living since the Mesolithic Age. Can Detective Walker save this ancient civilization? And will anyone believe him? Murder, mystery, and mole-men await in this hollow earth adventure.