A masquerade party at the Hendricks’ mansion quickly turns into a mystery when Nancy and her favorite date, Ned Nickerson, spy a stranger about to climb the rose trellis to the second story. Who is this enigmatic man in the black cloak and the exotic woman in the Javanese costume? Are they members of a gang of wily thieves who sneak into partied given by wealthy people and steal jewels and art treasures? And why is the owner of the black velvet...

When Nancy Drew receives a valuable moonstone as a gift from an unknown person, she is amazed and puzzled. But it is only the first of several startling events in this complex mystery that challenge the ingenuity of the pretty sleuth.
Why are the Bowens – a missionary couple who recently returned to the United States – having so much trouble finding their missing seventeen-year-old granddaughter, Joanie Horton? Nancy and her friends...

Nancy Drew solves two mysteries when she learns the origins of an eerie wheel of fire.

An anonymous diary is a mystery with handwriting that is difficult to decipher. It is filled with technical drawings and chemical formulas. Was the destructive explosion an accident or an act of revenge?

Mrs. Strook requests Nancy's help finding an old stagecoach she believes her uncle hid in her hometown of Francisville. Mrs. Strook believes the stagecoach houses a clue that will be valuable for the town! Can Nancy help her find the missing stagecoach?

Nancy Drew must search for a flight of 99 steps to solve the mystery of a friend’s weird dream. Her search leads her to France, but before she leaves the United States, an unknown person calling himself Monsieur Neuf warns the young sleuth not to pursue her mission.
With her friends Bess and George, Nancy arrives in Paris to join her father who is working on another case: to find out what, or who, is frightening wealth financier Monsieur...

Nancy Drew and her friends go on a ghost hunting expedition and become involved with a gang of thieves who concentrate their activities on collectors of valuable shells.

The blatant acts of a lady swindler posing as Nancy Drew arouse the suspicion of friends and local police against the real Nancy.

When Nancy Drew and her friends go to a lake in New York to investigate reports of a woman gliding over water, they discover a treasure underwater.

Nancy Drew and her friends go to New Orleans in time for Mardi Gras, and help solve a mystery while they are there.