When Nancy receives a letter informing her she’s heir to a fortune, she decides to track down the sender, as well as the other Nancy Drew.

The strange disappearance of a young Turkish client of Mr. 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. What happened to the attractive figure that Farouk Tahmasp used in the display window of this rug shop? Who is trying to keep Nancy from finding it – and why? Tracking down the intricate trail of clues takes Nancy and her friends Bess and George, Ned, Burt, and Dave to Turkey. Their sleuthing leads them to the Grand Bazaar in the exotic city of Istanbul, where Bess mysteriously disappears. Suspense mounts when Nancy encounters a vengeful enemy at an ancient underground reservoir. Events move swiftly as Nancy and her friends try to solve this challenging mystery!

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.

When Nancy arrives at the McGuire’s fitness ranch in Arizona, she discovers that the future of the ranch is being threatened by unexplained accidents. Teaming up with a ghost, Nancy begins her search for a precious collection of ancient Kachina dolls that may unlock the motives of her elusive adversary. Will the person determined to prevent the ranch from operating succeed?

Kitty and Johnny Blair, two famous actors, adopt baby twins who were mysteriously found in a boat along the river. The cruel Blairs have only adopted the babies as a publicity stunt, as they hope to raise the children as actors, which will help their own careers. Nancy sets off to find their real mother and take them away from the Blairs.

Nancy Drew and her friends visit an old clipper ship in Boston harbor and help Captain Easterly uncover a mystery.

The Hidden Window Mystery: Nancy and her friends, Bess and George travel to Charlottesville, Virginia in search for a missing stain-glass window.

While driving a motorboat around the Twin Lakes, Nancy and her friend Helen get caught in a dangerous storm. Luckily, they are rescued by another teenage girl in a rowboat. They soon learn that their rescuer is Laura Pendleton, whose mother has recently having passed away. Laura has come to meet up with her new guardians, but something isn't quite right about them. Nancy investigates the situation, and soon she stumbles upon a shocking surprise in the cellar of a bungalow!

Nancy meets Helene and Henri Fontaine, refugees from Centorvia who run a dancing school in River Heights. Strange circumstances have brought the brother and sister to the United States. When they receive an anonymous note threatening their lives, Nancy offers her help, but she encounters nothing but puzzles. Are the Fontaines involved with the Centrovian underground? Have they been threatened by their own countrymen? When the Fontaines disappear, Nancy and her friends pursue the trail, even though danger lurks around every corner.