The Clue in the Old Stagecoach

The Clue in the Old Stagecoach is the thirty-seventh volume in the Nancy Drew Mystery Stories series. It was first published in 1960 under the pseudonym Carolyn Keene. The actual author was ghostwriter Harriet Stratemeyer Adams.

Plot summary
Nancy searches for an antique stagecoach that, according to legend, contains something of great value to the people of Francisville.