Rio Blanco is a dying town until a snake-bit prospector collapses in the street clutching a chunk of gold and gasping last words about the Lost Doubloon mine. Word spread like wildfire. Driven by their lust for riches, they're in a race that can only have one winner. Among them is a murderer--and ahead of them in the mountains is a mine guarded by a viper's nest of treachery.