The Aldens investigate a mystery from the Gold Rush!The Aldens investigate a mystery from the Gold Rush!When Cousin Joe's friend disappears, the Aldens are eager to help find where he's gone. Their journey leads to the Superstition Mountains in Arizona, where a story about a lost gold mine has attracted treasure hunters for more than a hundred years. Did the legend bring Joe's friend to the West? To find out, the Aldens will need to dig in to a mystery going all the way back to the Gold Rush.