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Nancy is warned not to go to Scotland but she does not heed the warning. Nancy, Bess, and George travel to Scotland to visit Nancy's great-grandmother at an estate in the Scottish Highlands. A family heirloom is missing and Nancy hopes to recover it. While there, Nancy becomes involved in the mystery of missing flocks of sheep and a mysterious bagpiper. Clues leading to a discovery in an old castle and a prehistoric fortress lead to the mystery's solution.
Nancy, Bess, and George travel to Emerson for the Emerson University June Week celebration to visit Ned, Burt, and Dave. They are invited to stay with John Rorick at his mansion on Pine Hill and soon become entangled in a mystery involving a lost family heirloom and a phantom haunting Pine Hill.
Nancy, Bess, and George travel to France to search for a flight of 99 steps to solve the mystery of a friend's strange dream. During her search, she must contend with the sinister Monsieur Neuf and help her father uncover who is frightening a wealthy financier into selling large amounts of securities.
Carla Ponce invites Nancy, Bess, and George to come to Peru to help decipher the mystery in the crossword cipher--a wooden plaque that promises to lead to fabulous treasure. Nancy must persue the treasure and avoid the dangerous gang of relic thieves headed by El Gato(The Cat.)
Carson Drew's client, a jeweler, is accused of stealing the spider sapphire which leads to a mystery that takes Nancy, Bess, George, Ned, Burt, and Dave on African Safari. Nancy uncovers a nefarious scheme and solves the disappearance of a missing jungle guide.
Nancy and her chums set out on a ghost-hunting expedition despite being warned not to. The hunt involves a canoe that paddles itself, a phantom horse, and several other hauntings. Nancy is pitted against a dangerous adversary and manages to outwit him in an eerie mansion.
The strange disappearance of a young Turkish client of Carson Drew's and the gift of an oriental rug with a coded message woven into its decorative border start Nancy on a difficult search for a missing mannequin. The search takes Nancy, Bess, George, Ned, Burt, and Dave to Turkey where Bess mysteriously disappears.
Nancy, Bess, and George spend an exciting week exploring a mysterious zigzag house with a crooked staircase and an unpredictable robot. Nancy is determined to solve the mystery of the weird house and locate the missing owner who is wanted by the police.
Aunt Eloise invites Nancy, Bess, and George to a cabin near Cooperstown, New York for a chance to solve the mystery of a woman who glides across the water. Nancy becomes involved in a vacation hoax because she resembles a woman involved in the hoax. A mysterious green sorcerer who appears in the woods and an lost treasure involving the gliding woman lead Nancy to help uncover a cleverly concealed operation in the woods.
A bird of ill omen is mysteriously left on Nancy's front lawn. Did the person who put it there do so with the intent of jinxing Nancy and her father? This strange incident involves Nancy in one of Carson's cases about a rare bird farm threatened with destruction to make room for a high-rise apartment house complex. The use of jinxes to threaten those who oppose the construction leads Nancy to track down the criminals behind the jinxing.