Nancy and her friends establish headquarters in a seaside yacht club to investigate strange happenings in a book store and the disappearance of a marble statue.

A carrier pigeon furnishes Nancy with a clue to a mysterious retreat.

A brass-bound trunk mistakenly delivered to Nancy's cabin on a New York-bound ocean liner becomes the first clue leading her to suspect that international jewel thieves are aboard.

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

Nancy Drew determines if an ivory elephant charm really protects its wearer from harm when she investigates the involvement of a member of the Bengleton Wild-Animal Show in a mysterious scheme.

On a visit to Misty Lake, Nancy helps her friend Cecily discover the truth about a family treasure hidden before the Civil War - the only clue being half of a golden locket. She also investigates allegations by Cecily's fiance that his record company is cheating him out of royalty payments.

Nancy Drew becomes involved in a double mystery concerning a haunted bridge and jewel thieves.