Still mourning the death of his wife, private investigator Mark Novak accepts a case that may be his undoing. On the same day his wife died, the body of a teenage girl was pulled from the extensive and perilous cave system beneath Southern Indiana. Now the man who rescued the girl, who was believed to be her killer, begs Novak to uncover what really happened. For Mark to delve beneath the town's surface, he must match wits with the man who knows the caverns better than anyone.