A hack mystery with a background of the Montana mountains provides some shady doings for the 16 year old twins, Dick and Linda. An old letter, mailed in the last century, turns up in an auction in a nearby ghost town and opens up prospects of a gold mine claim and a suspicious hand on their uncle's ranch and a crochety neighbor are fair game for the young detectives. With pedestrian sleuthing, rightful ownership is proved and Linda and Dick get their stake as partners.