Nancy gets involved in mystery when she receives a valuable moonstone from an unknown person.

A cunning thief is desperate to wreck the opening of a historic landmark -- and Nancy is his target! On Gramercy Park in New York City, the magnificent Van Hoogstraten mansion with its priceless collection of glass birds is about to open to the public. Nancy, Bess, and George are invited, but a series of sinister events puts everything in chaos. When the centerpiece of the collection, a beautiful crystal bird, is stolen, Nancy gets on the case. From...

A cemetery of dark secrets... and Nancy's in the middle of it! Shady Glen was no different from any other cemetery -- maybe a little spooky, but harmless nonetheless. At least that's what Nancy thought until she stumbled onto a treasure map...and stumbled into a world of trouble. The map leads Nancy into a network of underground passageways, where she uncovers a series of clues to a recent outbreak of robberies and the location of a long-lost fortune...

CIRCUMSTANTIAL EVIDENCE DOESN'T PROVE THE IDENTITY OF CRAFTY THIEVES! Nancy's friend Bess has been hired by Special Effects, a River Heights company, to decorate Albemarle's department store for the holidays. When Bess discovers that her friend Ali Marie is now working at the store, she's thrilled -- the two of them can have lunch and try on clothes for fun! But when some dresses are swiped, Ali is accused of stealing, and the party's over. Sure of...

A SEARCH FOR A MISSING HORSE LEADS NANCY TO A DARK DISCOVERY! Nancy's attending the Midwest Grand Prix Dressage Championships, where many of the world's best riders and finest horses compete. But more than blue ribbons is at stake. As Nancy quickly learns, these horses generate big money, turning a friendly competition into a very nasty business. Discovering a fire in the stables, Nancy barely averts a terrible tragedy. But now she faces a new danger:...

On a winter vacation in Wisconsin, Nancy and her friends stay in a two-hundred-year-old castle where there is the rumor of a hidden treasure.

Nancy's going to the White House, where George is interning as a photographer's assistant. On the day of her arrival, a photo session of a priceless solid-gold statue is under way. But something is wrong with this picture-Nancy gets knocked out cold and now the statue is missing.

Nancy tries to find out who is trying to sabotage the International High School Track and Field Games before it is too late.

Nancy can hardly believe it. While visiting an amusement park owned by the world-famous Royal Chocolates Company, her friend Bess tears open a million-dollar candy wrapper in a contest. But when they go to collect, they're told that someone else has won. And then they're accused of tampering with the winning wrapper! Something is rotten in chocolatetown. The proof comes when Nancy and her friends are treated to a near-death experience in the park's...

While doing a favor for her father in Bear Hollow, Indiana, Nancy tries to help a new friend find the reasons someone is trying to ruin her family. A long-lost family secret and an inherited fiddle seem to hide clues to a secret fortune.