While Nancy attends the Martha's Vineyard Film Festival, a movie masterpiece is stolen, and her investigation puts her in danger of being cut out of the picture for good.

Nancy tries to prove that a babysitter is being framed when three houses in River Heights are robbed—and the only connection the police can find is that the babysitter was employed at each.

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 animal safari. Someone’s pulling a million-dollar swindle, and getting Nancy and her friends out of the way seems to be the icing on the cake. If Nancy isn’t careful, she just might learn the real meaning of “Death by Chocolate.”

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.

When the curtain goes down, the real drama begins… The American Grand Opera has come to River Heights to perform Tosca, Aida, and The Marriage of Figaro, and Nancy’s friend Bess is going to be a chorus extra. It’s all so exciting for the girls; the costumes, the music, the glamor! Little do they expect, though, the drama that will take place backstage. When a falling sandbag from the scenery catwalk nearly misses the two female stars of the opera during a dress rehearsal, Nancy begins to suspect foul play. As it turns out, the falling sandbag isn’t the first incident of the tour. In the dressing room, Nancy finds out that rival singers Rosacrucia Alba, the hot new soprano, and Marta Willentz, an older member of the company, have been involved in a few scary situations. As rehearsals continue and the threat to these singers increases, Nancy scrambles to determine why someone is trying to ensure that only one singer will be the star of these shows.

This resort has the recipe for disaster! Nancy’s thrilled that she, Bess, George, and Hannah will be attending the grand opening of the newly renovated Gourmet Getaway. Not only will they be able to eat four-star meals prepared by master chefs, they’ll get to take cooking classes with them, too. But before the table’s even set, problems start plaguing the resort, both in and out of the kitchen. Nancy can’t believe it’s just bad luck, but who’s causing all the problems? Nancy puts her cooking on the back burner so she can devote her attention to solving the mystery. Can she manage to find out who’s behind the trouble before more sabotage is served?

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 in gold. She follows the hidden tunnels into the cold, dark heart of the cemetery and comes face-to-face with the chilling secret of Shady Glen!

How many strings will fray before a family business falls apart? Nancy, George, and Bess are going on a vacation to Paris, and Nancy’s father pulled a few strings to get the girls some quaint accommodations: a tiny top-floor flat in a small three-story house on the Ile Saint Louis. The first floor of the building is a puppet theater, museum, and shop, owned by twenty-seven-year-old Mimi Loiseau, who lives on the second floor. Mimi’s great-grandmother had always hinted at a unique family treasure, but she died before she could tell Mimi what, or where, it was. Now someone is stealing puppets and vandalizing apartments. Could this someone be looking for the long-lost treasure? Nancy’s on the scene just in time to help save Mimi’s business—and to make sure they all get home in one piece!

Things are hairy in River Heights this holiday season. Two wolves have disappeared from WildWolf, the federal wolf preserve just outside of town. Local farmers think the missing wolves are killing their sheep, but there are also rumors of werewolf sightings nearby. At the same time, the annual River Heights Winter Carnival is set to begin. When the first two days of the outdoor festival are full of tragic disasters, Nancy can’t help but wonder—is there a link between the carnival's trouble and the missing wolves? After the carnival’s beautiful ice palace is destroyed, Nancy’s sure there’s a wolf at River Heights’s door. But is the leader of this pack of crimes human, or beast?

This summer, nothing’s safe at Green Spring—not even the camp itself… Elsa, a friend of Nancy and George’s and a counselor at Green Spring Pony Club’s summer camp, invites the girls for a ride one afternoon. Along the way, Elsa gushes about how a team of campers will compete in a regional pony club rally. If they win, they’ll go to the national competition! But Elsa’s excitement quickly fades when Nancy’s horse falls into a ditch, and it’s clearly a case of sabotage. This prompts Elsa to tell Nancy about some sinister happenings on the camp’s grounds. Is someone trying to hurt the campers—or the camp? Disguised as a counselor, Nancy tries to figure out who's behind the vicious accidents. And as they become more devastating, Nancy realizes she needs to move quickly. Will her sleuthing skills be enough to keep this camp’s horses and their riders on track?