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!

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.

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.

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.

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

Nancy Drew must search for a flight of 99 steps to solve the mystery of a friend’s weird dream. Her search leads her to France, but before she leaves the United States, an unknown person calling himself Monsieur Neuf warns the young sleuth not to pursue her mission. With her friends Bess and George, Nancy arrives in Paris to join her father who is working on another case: to find out what, or who, is frightening wealth financier Monsieur Leblanc into selling large amounts of securities. Startling discoveries convince the young detective that Mr. Drew’s case and her own mystery are linked by the 99 steps, and that a mysterious man has a strong hold over Leblanc. Is it blackmail? Nancy’s quest for further clues leads to the romantic chateau country in the Loire Valley, where a web of danger closes in tightly around the three girls.