Most Popular Books by Carolyn Keene

Nancy, Frank, and Joe investigate the murder of a real estate king's ward in Philadelphia. Nancy believes the accused is innocent while Frank and Joe believe he is guilty.

T-R-O-U-B-L-E. EVERYBODY KNOWS WHAT THAT SPELLS! Nancy, Bess, and George are doubly excited. Not only are they taking horseback-riding lessons, but Bess is in the school spelling bee. And maybe her mom's lucky horseshoe earrings will help her win! But now the earrings have disappeared. Good thing Nancy's around to help Bess solve the mystery -- because a good friend is the best good-luck charm of all!

Challenging questions confront Nancy Drew when she attempts to solve the mystery of the strange tapping sounds in the house of a retired actress. Who is the tapper? How does he gain access to Miss Carter’s house, despite securely locked doors and windows? Why do the tapping sounds come in Morse code? Is there a sinister motive behind the prowler’s actions? While trying to learn the answers to these and other puzzling questions, Nancy finds her investigations complicated by the dishonest administrator of a will and by a thief who steals the actress’s prize Persian cats.

Sleuth Nancy Drew and her friends travel to Utah in search of hiking and biking, but instead they end up searching for missing park ranger.

A magazine article offering a large reward to anyone who can find a missing medieval stained-glass window intrigues Nancy. She asks Bess and George to join her on a search in Charlottesville, Virginia. Before the three friends leave River Heights, their adversary tries to get them to postpone the trip. But no luck. Nancy is determined to carry through her plans. During the girls' investigation of old southern mansions, they encounter a ghost who turns the tables and makes them disappear. Eerie sounds come from a beautiful estate that is surrounded by a high brick wall. Why will the owner allow no one to enter?

Nancy, Bess, and George pick the perfect subject for their class science project: ice cream! But when they study ice cream at two ice cream shops, they find a conspiracy to close one of the shops.

Nancy tries to crack the case of a stolen Faberge egg while also tracking down a vegetable garden vandal.

Nancy goes undercover as an investigative reporter after threats are made on the life of handsome WRVH-TV News anchorman Hal Taylor. The evening news is filled with violence, ambition, and greed—and that’s just behind the camera! Can Nancy get to the bottom of who’s after Hal in time?

George is upset. Everyone’s going on a field trip except her. Why? Because the teacher says she was passing notes in class. But she wasn’t. Someone was passing notes to her! Maybe if Nancy can find out who did write the notes, the teacher will change her mind. The funny thing is, Nancy has to find someone who really likes George!

While visiting Ned Nickerson at college, Nancy must ask him some sensitive questions after a scandal breaks out that could lead to his expulsion. and she uncovers a secret obsession that puts more than broken hearts at stake.

The Internet...a world without rules, without boundaries. And it’s all just a click away... Ryan Corrigan is not what most people would call a “cool” guy. He’s usually called something more like geek or cyber-nerd. Maybe it’s because he and his mom move almost every year, so he never gets a chance to make friends. Or maybe it’s because he spends most of his time glued to his computer. It’s his friend. But now Ryan’s “friend” has gotten him into some big trouble. If Ryan doesn’t find a real ally fast, he could end up in jail—or worse, a victim of a terrible “accident.” Different people in different places—the one thing they have in common is a new address on the Internet: Danger.com. Where all your fears come true…

Nancy finds an old diary in her house with secret clues and hiding places around town.

Revenge rides a dark horse—and Nancy’s the target! Nancy is going to visit one of her best friends, Colleen, who is horse crazy and has her own horses. With one of the best of them, Nightingale, she is going to race in the Midwest International Horse Show. The prizewinning filly is worth a cool $200,000, and that kind of cash can breed plenty of greed, ambition, and danger. Soon Nancy has her hands full trying to stop the mysterious culprit, The Masked Rider, who wants to kill Nightingale.

The future freedom of ten orphans is in Nancy's hands!

Blue bells will be singing horses! This strange message, attached to the leg of a wounded homing pigeon, involves Nancy Drew in a dangerous mission. Somewhere an elderly woman is being held prisoner in a mansion, and Nancy is determined to find and free her. Meanwhile, the young detective’s close friend, Helen, begs her to solve a second mystery. Helen’s grandparents, the Cornings, are frightened by a sinister wheel of blue fire that appears after dark in the woods outside their home at lonely Sylvan Lake. When Nancy discovers the significance of the eerie signal, she also learns that her two mysteries are connected.

A desperate call from an old friend brings Nancy to Seattle to investigate a possible murder.

Nancy's puppy is blamed when chocolate chip muffins go missing, and Nancy must follow clues to prove his innocence and find the real culprit.

In a winter wonderland, Nancy takes a walk on the wild side! Nancy, Bess, and George are staying at a rustic lodge in Wyoming, looking forward to fun winter sports like skiing and dogsledding. But their vacation plunges into mystery when Rainbow, the lodge’s tame pet wolf, suddenly disappears, leaving her five newborn pups motherless. Then Nancy learns that the lodge owners are creating a wolf sanctuary on their land—and not everybody is happy. Was stealing Rainbow meant to be a warning? As Nancy investigates, her suspects include a hostile neighbor, a young wolf expert, and a handsome ranch hand. And if she’s not careful, someone in the white wilderness will snow her under for good!