Books like The Missing Formula by Mildred Augustine Wirt Benson

During a friend's wedding, Nancy confronts swirling rumors, scandal whispers, and betrayal, racing to prevent a murder that threatens to ruin the celebration.

Nancy Drew must outwit an extortionist who has taken on her identity, turning a quiet investigation into a tense game of deception and danger for the teenage sleuth.

During the much‑anticipated softball showdown between River Heights and Red Rocks, River Heights’ trophy and mascot costume vanish—prompting Nancy Drew to uncover the culprit and restore order before the game.

Nancy Drew visits her father's law firm and discovers a murder case, prompting her to use her detective skills to bring the culprit to justice.

Nancy Drew, now eighteen, embarks on a thrilling treasure hunt, tracking a long‑missing man to uncover the second half of a buried treasure map.

Nancy Drew investigates a wave of rare‑book burglaries, confronting danger while solving the mystery.

Nancy Drew and friends investigate a sudden silence on Dan "the Wild Man" Wildman’s radio show after a startling crash. Their sleuthing uncovers a mystery that takes them from the studio to the streets of California.

Madge's summer vacation has ended, and she is back in school. Madge and her friends initiate Cara Wayne into their secret society by requesting that Cara visit the spooky Swenster mansion at night. Cara comes back tremendously frightened because she saw a ghost digging on the property. While the other girls are skeptical, Madge feels that Cara did see something strange. Madge and Cara visit the Swenster mansion the next day and meet Agatha Swenster, who plans to sell the house. The girls quickly become friends with Miss Swenster and help her prepare the mansion and its contents for auction. The girls learn of a valuable pearl necklace that has been missing for years and how much its recovery would mean to Miss Swenster. The girls search for the pearl necklace and hope that they can recover it so that Miss Swenster does not have to sell the mansion.

Madge Sterling arrives at Cheltham Bay to spend a few weeks with her friend, Enid Burnett, and her father on their yacht, The Flora. Much to Madge's surprise, no one meets her at the dock. Madge hires a man to row her out to the yacht which appears to be deserted. Madge finds that Mr. Burnett's room has been ransacked and then discovers Enid a prisoner in the closet. Enid reports that her father has been abducted by several men. A ransom note is found the next day, requesting that Enid deliver Mr. Burnett's Zudi Drum Bowl to a location approximately 50 miles up the coast. Madge and Enid wonder why the kidnappers want the bowl instead of money. Enid is determined to take the bowl to the requested meeting place, but Madge and Enid's friend, Rex Stewart, are unconvinced of the wiseness of the mission. They follow Enid on her journey so that they can help her if something goes wrong.

Nancy spends a weekend at the former estate of famed mystery writer Dorothea Burden, only to find a real jewel‑theft mystery unfolding—and a chance to solve it with her detective skills.

Nancy suspects the long‑lost son of a recently deceased millionaire who appears at the will reading is an imposter.

Nancy Drew and her friends Bess and George dive into a mystery at the new Backbeat Café, where a smoke bomb explosion throws the trio into a web of intrigue.

Nancy must uncover the culprit trying to sabotage her friend Sydney's wedding to a reality‑show star, navigating intrigue and celebrity scandal along the way.