Carolyn Keene

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.

On her way to Red Gate Farm, Nancy encounters a mysterious saleswoman in a perfume shop, a curious man on the train, and a strange code to be deciphered, but when she arrives at the farm, Nancy is compelled to investigate her suspicions that part of the farm is being used for a secret society's meetings.

Terry Scott, a young archaeology professor, seeks Nancy's help in unearthing a secret of antiquity which can only be unlocked by three black keys. While on an archaeological expedition in Mexico, Terry and Dr. Joshua Pitt came across a clue to the buried treasure. The clue was a cipher carved on a stone tablet. Before the professors had time to translate the cipher, the tablet disappeared--and with it Dr. Pitt! Terry tells Nancy of his suspicions...

Asked to locate a stolen necklace of unusual value, Nancy soon discovers that strange and dangerous people are responsible for the theft.

A search for stolen jewelry takes Nancy to New Orleans where she uncovers a swindling racket in which a medium uses her trade to relieve victims of their valuables.

A fiery glowing eye in a museum, the abduction of Ned, the code name Cyclops, and a pilotless helicopter draw Nancy and her friends into a dangerous investigation.

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.

Nancy and her friends help a woman search for her missing grandson.

This third entry from the much-loved Nancy Drew and the Clue Crew series finds the clever detective and her friends investigating a Houdini of a pony. When a new petting zoo opens in town, Buttons becomes the star by escaping every night and showing up on someone else's lawn to eat the flowers. Nancy quickly jumps on the case-because even though she'd love to see Buttons on her lawn one morning, it's more important to keep him safe at the zoo.