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.

While trying to help a friend out of a difficulty, teenage detective Nancy Drew has a perilous experience in and around a deserted bungalow.

Nancy and her friends become involved in a search for lost treasure.

Nancy, Bess, and George are on a cruise ship tour of Alaska, and the cruise director needs Nancy's help when strange things keep happening.

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...

When a gang that uses parties as a cover for robberies victimizes a masquerade party Nancy is attending, the teen-age detective switches identity with her girl friend to solve the case.

Nancy Drew's keen mind is tested when she searches for a missing will.

"What happened?" I asked, leaning against a folding chair as I tried to catch my breath. Julia glanced up at me coolly, and then reached for a box I hadn't noticed on the other side of the table. "Well, we received a disturbing package," she said. The box was about a foot square. Carefully angling it away from Carrie, Julia cracked the top of the box open. When I saw what was inside, my stomach roiled and I had to look away. Who would send something...

During classmate Dierdre's "sweet half-sixteen" birthday party, Nancy Drew and her Clue Crew friends investigate who threw a snake into the pool--and why.