Nancy Drew and her friends are plunged into a network of strange events when they visit Misty Lake. The very night they arrive, they meet pretty, red-haired Cecily Curtis who seeks Nancy's help in solving two mysteries: one concerning Cecily's fianc?, Niko Van Dyke, a popular singer who believes that his record company is cheating him of royalty payments; and the other, involving a family treasure hidden before the start of the Civil War - Cecily's only clue being half of a gold locket.