Riley, Charlie, and the McGregor twins barely survived their last escapade. Still, they are beyond surprised with their parents' extraordinary graduation gift: a new adventure at a dude ranch mystery club. While on a treasure hunt to uncover the secrets surrounding an old prospector's hidden gold, the teens find themselves as pawns in a ruthless scheme to take over the ranch. As perilous obstacles threaten the super sleuths on their treacherous quest to locate the treasure, they soon discover that they are not the only ones interested in unearthing the old miner's fortune. Prying eyes watch from the shadows, lying in wait for the opportunity to sweep in and claim the riches for themselves. Without any idea that an innocuous mystery venture could lead to dire consequences, the teens soon realize that greed has no boundaries, and all that glitters is not gold. Or is it? In this fast-paced thriller, dangerous, unexplained hazards threaten four teens on their treacherous quest to unlock the mystery of an old prospector's hidden treasure.