Excitement is high when Nancy delves into the theft of a fabulous sapphire formed by nature millions of years ago. Her father’s client is Mr. Ramsey, a designer of beautiful and unusual synthetic gems. He is accused of stealing the magnificent spider sapphire and exhibiting it as his own creation. In River Heights and while on a safari with a group of college students, Nancy has several thrilling experiences. In Africa, she uncovers a nefarious scheme directed at Mr. Ramsey and locates a missing jungle guide. This book is the original text. A revised text does not exist.

Dream trip? Or a nightmare of trouble? When Hannah Gruen inherits a farm from a distant cousin, the Drews, with Bess and George, drive off for a scenic Oklahoma vacation. The plan is to sell the property and pack up whatever mementos Hannah wants to keep. But a terrifying encounter with a tornado is just the beginning of trouble. In a duffel bag Nancy discovers what looks like a ransom note—and a gruff intruder appears, insisting that the bag is his! Is he planning a kidnapping? Nancy contacts the local police, but they think it's a prank. When charming Derek Owens, a tornado chaser at the local university, offers to help, Nancy accepts faster than a lightning flash. But the clues she discovers lead her deeper into peril, and Nancy's soon fighting for her life—in the eye of a monster storm!

When Dan Wildman, one of River Heights's hottest rock 'n' roll DJs, is kidnapped, Nancy Drew is on the case!

In this Nancy Drew and the Clew Crew adventure, Nancy and her friends must track down a beautiful—and very rare—butterfly when it goes missing from the new butterfly museum. Nancy, Bess, and George can’t wait to check out Flutter House, an awesome new museum that’s all about butterflies! The girls are thrilled when they get to see the beautiful creatures up close and personal. But soon after their class leaves, the rarest butterfly, a Blue Morpho, goes missing! It’s up to the Clue Crew to get the valuable butterfly back safely. But with a long suspect list and not many clues, it’s going to be a tough case for Nancy and her friends.

Riding uphill is hard—but going down can send you over the edge! Nancy, Bass, and George are all geared up for a bike tour in Ireland. They're looking forward to spectacular scenery, romantic ruins, local entertainment, and, at the end of the day, cozy inns to welcome them. But it isn't long before the three friends realize that they're riding with danger. From the moment they arrive at the airport, someone seems to be targeting the tour members, especially the two teen sisters from Australia. Even worse, not all the cyclists are what they appear to be. As the group bikes along sheep-filled roads and steep seaside cliffs, the menace mounts. Nancy knows that if she makes one wrong turn she'll be on a detour to disaster!

The young sleuth travels to Cornwall, England to uncover a mysterious coven of witches plaguing an old friend.

The Pineview girls' soccer team attempts to raise money by selling a pair of brooches, but a thief who substitutes phonies may bring disgrace on the school if Nancy cannot solve the case in this high-stakes high school caper.

Eight-year-old Nancy Drew has her first case to crack! Can you help? Nancy and her two best friends, George and Bess, are so excited! They have been invited to Deirdre's sleepover party! There will be pizza, cake, and even a pajama fashion show. But the most exciting thing is that the party has a City Girls doll theme. All of the guests are bringing their dolls with them! But then Deirdre's City Girls doll -- Hollywood Heather -- goes missing. Is her sleepover ruined? Or is there a detective in the room who can make sense of this mystery?

While working for a TV news team, Nancy gets a chance to cover a breaking story at the zoo—a cougar, belonging to one of the world's endangered species, has given birth to four cubs. But the wondrous news turns wicked when the cubs are stolen.

THE UNICORN DIDN'T JUST WALK AWAY. . . . Mari Cheng is the new girl in Nancy's class. She's kind of shy and doesn't talk much. On show- and-tell day Mari has a big surprise and she's really excited. But when the day is over, she's really sad. Mari brought in her special toy -- a beautiful unicorn with a silver mane -- and somebody stole it! Now what Mad needs most is a special friend to help her feel better -- and maybe find Silvermane. Someone like Nancy Drew!

Nancy's father Carson Drew enlists her help in tracking down a missing heiress, and Nancy, Bess and George stumble upon a mysterious moss-covered mansion. The girls learn someone was murdered near the mansion and they hear strange noises coming from inside the building. Action bounds in this thrilling adventure involving gypsies, a missing heiress, a needy elderly lady, a reclusive artist, an airplane accident, and a forest fire

Help Nancy and her friends find a missing tortoise in the eleventh book in the interactive Nancy Drew Clue Book mystery series.Nancy, Bess, and George have been looking forward to their school trip to the Wildlife Refuge for weeks. They've been studying all the different animals they'll see there—pygmy hedgehogs, scarlet macaws, and ball pythons. Nancy is most excited to see the sixty-year-old tortoise—that hard-shelled creature is older than her dad. But when her class reaches the enclosure they find out the tortoise is on the loose! Nancy and her friends are on the case. Can they save the day before the class trip is over? Or will this sneaky reptile outsmart them all?

On a tour of the National Aquarium in Baltimore, Nancy is asked to look into a series of threats against the staff. But the controversial curator, whose stand against industrial pollution had sparked conflict, is immediately killed. Nancy races to solve the crime before the murderer strikes again.

With George and Bess's help, I joined the online group BetterLife to unmask the identities of some nasty cyberbullies who were harassing a friend of Bess's sister online. Little did I know that my sleuthing would lead me into even more trouble! Now the cyberbullies are after me. Someone has hacked into my BetterLife account and manipulated my avatar to do things I would never do in real life. Now this case is personal. My friends and I need to do some major cybersleuthing to identify the bullies before it's too late!

A thief, a saboteur, even a ghost—these are just a few of the uninvited guests turning multiple weddings into a weekend of mystery, mischief, and danger. Nancy needs quick answers, or the weddings could add up to one major disaster.