Nancy receives a letter meant for a British heiress who has the same name and, in her attempts to contact the other young woman, faces danger from a man who operates a Lonely Hearts Club mail fraud.

Nancy Drew solves her first mystery when the accidental rescue of a little girl who lives with her two great-aunts leads to an adventurous search for a missing will.

Nancy arrives in Phoenix, Arizona, eagerly looking forward to a fun-filled vacation at Shadow Ranch but finds herself embroiled in a baffling mystery involving a phantom horse and buried treasure. Local people believe that the ghostly animal is carrying out the curse of Dirk Valentine, the romantic outlaw who was killed many years ago at Shadow Ranch, where he had gone to fulfill a promise to his sweetheart. Suspecting that a treasure hidden by Valentine...

At a doll collector's request for help, a young sleuth searches for an old album, a lost doll, and a missing gypsy violinist.

Blind violinist Deirdre Thompson is vying for top honors in a musical competition, but the concert hall is the focus of a criminal conspiracyand Deirde is the first to sense trouble and face danger.

Nancy Drew sets out to prove that her father's client was unjustly accused of trying to sabotage the United States space program.

Nancy must discover who is blackmailing a foreign exchange student who is staying with one of Nancy's neighbors.