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When the Topham family inherits all of Josiah Crowley's fortune, something isn't right about the whole affair. Josiah promised other friends and relatives that they would inherit. In Nancy's first case, she searches for a hidden will in order to help restore the inheritances to the rightful heirs. Being locked in a closet by robbers and a narrow escape with an old clock lead to Nancy solving this baffling mystery!
A visit by a sinister fellow who claims Carson Drew swindled him out of land that was condemned for the railroad leaves Nancy shaken as the man threatens harm if he does not get his money back. Meanwhile, mysterious goings on and thefts of personal items at the home of the Turnbull sisters leads Nancy to try and catch the house "ghost." Someone is trying to get the Turnbull sisters to leave The Mansion! Carson Drew's disappearance and a series of events that put Nancy in danger as she discovers a hidden staircase and secret passageway lead to the resolution of this spooky and suspenseful mystery.
Nancy resolves to help chum Helen Corning's aunts solve the mystery of the ghost who seems to be haunting their home, Twin Elms. A mysterious man appears at the Drew home to warn Nancy and her father that Carson is in danger. This warning leads Nancy and Carson to search for the missing Willie Wharton, a land owner, who can prove he signed away his land to the railroad and save the railroad from a lawsuit. Meanwhile, the disappearance of Carson Drew, thefts and mysterious goings on at Twin Elms, and the discovery of a hidden staircase lead Nancy to solve this baffling mystery.
When Nancy and Helen Corning get swept up in a lake storm , mysterious Laura Pendleton comes to their rescue. Her mother recently having passed away, Laura has come to meet up with her new guardians and something isn't quite right about them. Their mistreatment of Laura leads Nancy to investigate and stumble upon a shocking surprise in the cellar of a bungalow. Nancy must use her wits to overcome the villains and solve this baffling mystery involving Laura's guardians!
A theft at Lilac Inn of Emily Crandall's diamonds leads Nancy on a search for the thieves to clear Laura's guardian, Mrs. Willoughby. In a dramatic ending, Nancy finds herself bound and gagged on a ship at the hands of the thieves. It's a mystery that begins and ends at Lilac Inn.
Nancy and her friend, Helen Corning, visit Lilac Inn to help their friend Emily Willoughby, whose diamonds are stolen. A mysterious ghostly figure on the grounds of Lilac Inn, a message with the words "blue pipes," and someone impersonating Nancy leads her dangerously on the trail of a gang of thieves with a dramatic conclusion aboard a ship. (The revision is mostly a brand new story and actually takes place centrally at Lilac Inn which makes for a nice story.)
Nancy, Bess, and George head to Arizona to visit Shadow Ranch along with Alice Regor, a cousin of Bess and George. Alice's father disappeared many years before. The plight of a young child, Lucy, who lives with a very mean woman, Martha Frank, leads Nancy to suspect something is not right. In her search to find out how Lucy came to be with Martha, Nancy solves not one, but two baffling mysteries!
Nancy, Bess, and George arrive in Phoenix, Arizona, eagerly looking forward to a fun-filled vacation at Shadow Ranch, but abruptly finds themselves involved in a baffling mystery. The ranch is being haunted by a phantom horse and maliciously damaged by an unknown enemy. 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. Nancy suspects that a treasure is hidden by Valentine on the ranch and becomes involved in a dangerous race to find the treasure.
A pleasant visit to Red Gate Farm turns into an exciting and dangerous mystery for Nancy, Bess, and George. The mystery involves the mysterious Black Snake Colony, a cult organization who holds strange meetings next door. A mysterious cave and a code to decipher lead Nancy on the trail of a ring of counterfeiters!
Nancy, Bess, and George return from a country carnival and witness an explosion in a beautiful country mansion. Fearing its occupants might be trapped in the fire, they rush to the rescue. A mysterious man who runs from the scene and a diary Nancy discovers lead to a mystery involving a man who either died in the fire or is missing and the man whose patent he stole.
When the Drew's mail is stolen, this puts their letter carrier in a bind. An inheritance meant for a Nancy Smith Drew, is mentioned in a letter mistakenly sent to Nancy. Nancy's search for the other Nancy Drew and the thief of the Drew's mail leads to the discovery of a thief trying to steal the heart of Ms. Smith Drew's inheritance!
Another exciting mystery begins for Nancy when her friends Bess and George visit The Sign of the Twisted Candles Inn and meet 100 year old Asa Sidney. The strange inn keepers seem to have some sort of hold over Asa and their foster daughter. When Asa dies, Nancy becomes embroiled in the middle of a family feud involving Bess and George which nearly costs her their friendship. In the end Nancy solves a baffling mystery involving the parentage of the inn keeper's foster daughter and foils the inn keeper's sinister plans.
"Blue bells will be singing horses!" This strange message, attached to the leg of a wounded homing pigeon, involves Nancy in a dangerous mission. Somewhere, an elderly woman is being held prisoner in a mansion. Nancy is determined to find and free Mrs. Eldridge. Nancy also stumbles upon a related mystery at nearby Sylvan lake with the help of pal Helen Corning. In the end, Nancy helps foil a ruthless ring of swindlers but meets danger along the way.