Duane Ollinger sinks everything he has into hunting for what he believes is a vast fortune of gold on his property; with each step he takes toward finding the treasure, the land appears to hold on tighter and stop him in his tracks.

With an access tunnel to the underground cavern finally opened, and a tantalizing clue discovered, Duane's son, Chad, takes a risky dive into the flooded cave system -- and what he finds defies all explanation.

Duane decides that the flooded cave is too dangerous to dive into again, forcing the team to explore new access points to the underground cavern system; something lurking in the darkness forces everyone to reevaluate their safety.

While searching unexplored areas of the ranch for an alternate entrance to the cavern system, the team discovers mysterious ancient markings on a cliff and a mining shaft dug deep into the mountain that could lead them right to the gold.