- ...Action!
- ARGON Building
- A Capitol Crime
- A Crime for Christmas
- A Date with Deception
- A Model Crime
- A Nancy Drew Christmas
- A Question of Guilt
- A Race Against Time
- A Script for Danger
- A Secret in Time
- A Star Witness
- A Talent for Murder
- A Taste of Danger
- Abby Sideris
- Abdullah Bakhoum
- Ace
- Ace/Gallery
- Adam Beach
- Addison Hammond
- Against the Rules
- Aglaeca
- Alan Payne
- Alan Penvellyn
- Alec Fell
- Alejandro del Rio
- Alex Saxon
- Alex Trang
- Alexei Markovic
- Alexey Konstantirev
- Alibi in Ashes
- Alvina August
- Amanda Bobbsey
- Amaya Alston
- An Instinct for Trouble
- Anasazi Cliff Dwellings
- Anastasia Romanov
- Andy Jason
- Anja Mittelmeier
- Antonia Scallari
- Antonio Fango
- Anything for Love
- April Fool's Day
- Arthur Hitchens
- At All Costs
- Austin Neely
- Bad Day for Ballet
- Bad Medicine
- Bad Times, Big Crimes
- Baron Otto von Ekartsburg
- Bashiir
- Bat Steep
- Beech Hill Museum
- Benjamin Hawkins
- Bess Marvin
- Bess Marvin (2019 character)
- Bess Marvin (2019 character)/Gallery
- Bess Marvin (video game character)
- Best of Enemies
- Bet's Best Bets
- Bet Rawley
- Betrayed by Love
- Big Island Mike's Immersion Excursion
- Big Top Flop
- Bill Kessler
- Bill Pappas
- Blackmoor Manor
- Blackrock Island
- Bonfire Masquerade
- Bonita Granville
- Bonus Editions
- Boo Crew
- Brady Armstrong
- Brenda Carlton
- Brenda Carlton (video game character)
- Brendan Malloy
- Brian Daglian
- Bridget Shaw
- Brooke Tavanah
- Bruno Bolet
- Buried Secrets
- Buried in Time
- Burt Eddleton (video game character)
- Ca' Nascosta
- Caddy
- Caitlin Malloy
- California Schemin'
- Cameos
- Camille Hurley
- Campo Santa Maria Formosa
- Candy Kingdom Chaos
- Captain's Cove Amusement Park
- Captain's Quarters Hotel
- Captive Heart
- Captive Witness
- Carmen Moore
- Carol Stephenson-Hughes
- Carolyn Keene
- Carousel
- Carson Drew
- Carson Drew (2019 character)
- Carson Drew (2019 character)/Gallery
- Carson Drew (video game character)
- Casa dei Giochi
- Casey Porterfield
- Cassidy Jones
- Castle Cast
- Castle Finster
- Castle Malloy
- Cathedral
- Celia Hudson
- Chandler Interiors
- Chantal Moique
- Charleena Purcell
- Charlie Murphy
- Charlotte Thornton
- Chase Relerford
- Chief McGinnis
- Chief McGinnis (2019 character)
- Chief McGinnis (video game character)
- Choosing Sides
- Circle of Evil
- Clara Thornton
- Close Encounters
- Club Dread
- Club Micio
- Clue in the Ancient Disguise
- Clue in the Clock
- Codes & Clues
- Coins
- Cold as Ice
- Colin Baxter
- Colton Birchfield
- Combo Cola
- Connie Watson
- Cookies
- Copper Canyon Conspiracy
- Copper Gorge
- Corine Myers
- Corky Veinshtein
- Coucou
- Cougar Bend
- Counterfeit Christmas
- Courting Disaster
- Creepy's Corner
- Crime at the Ch@t Café
- Crime in the Queen's Court
- Cromwell
- Crosscurrents
- Curse of Blackmoor Manor
- Curse of the Arctic Star
- Cutting Edge
- Dagny Silva
- Dance Till You Die
- Danger Down Under
- Danger Overseas
- Danger at the Iron Dragon
- Danger by Design
- Danger for Hire
- Danger in Disguise
- Danger on Deception Island
- Danger on Parade
- Danger on the Great Lakes
- Dangerous Games
- Dangerous Loves
- Dangerous Relations
- Danielle Hayes
- Darryl Trent
- Daryl Gray
- Dashiel Biedermeyer
- Dave Gregory
- Dawn Ziegler
- Dead on Arrival
- Deadly Doubles
- Deadly Intent
- Death by Design
- Debbie Kircum
- Deep Secrets
- Dehlia Draycott
- Deirdre Shannon (book character)
- Deirdre Shannon (video game character)
- Demons of the Deep Haunted House
- Designs in Crime
- Desperate Measures
- Detective Beech
- Dexter Egan
- Diamond Deceit
- Diana Marvin
- Diego Valdez
- Dieter von Schwesterkrank
- Dirk Valentine
- Dirk Valentine's Treasure
- Don't Look Twice
- Donal Delaney
- Double Crossing
- Doubtful Sound
- Dread Isle
- Dressed to Steal
- Drew
- Dry Creek
- Duck Derby Debacle
- Dwayne Powers
- Dwayne Powers's Office
- Dylan's Tours
- Dylan Carter
- Earth Day Escapade
- Easter Eggs
- Easy Marks
- Ed Rawley
- Ed and Bet Rawley
- Eda Brooks
- Eden Summer Gilmore
- Edgar Allan Poe
- El Toro
- El Toro's Treasure
- Elinor Penvellyn
- Elisabet Grimursdottir
- Ellie Humber
- Ellie York
- Elliott Chen
- Eloise Drew
- Eloise Drew (video game character)
- Elsa Sibblehoth
- Else Amsel
- Em's Emporium
- Emily Crandall
- Emily Foxworth
- Emily Griffin
- Emma Roberts
- Enemy Match
- Enrico Tazza
- Ethel Bossiny
- Eustacia Andropov
- Everett Hudson
- Evil in Amsterdam
- Ewan Macleod
- Exhibition of Evil
- Ezra Wickford
- False Impressions
- False Moves
- False Notes
- False Pretenses
- Famous Mistakes
- Fatal Attraction
- Fatal Ransom
- Fatima
- Final Notes
- Fiona Malloy
- Fishing for Clues
- Flirting with Danger
- Flying Too High
- For Love or Money
- Foreign Editions
- Framed
- Frances Humber
- Frank Hardy + Nancy Drew
- Franklin Rose
- Franz Mittelmeier
- Freddie Randall
- Frosty Harlow
- George Fan
- George Fan/Gallery
- George Fayne
- George Fayne (video game character)
- Getting Burned
- Ghost Dogs of Moon Lake
- Ghost Stories (Girl Detective)
- Ghost of Thornton Hall
- Gil Bobbsey
- Gilbert Buford
- Gloria Crandall
- Gold Medal Murder
- Gorf
- Graeme Duffy
- Granny Punkin's
- Gray Cortright
- Greek Odyssey
- Grigor Karakinos
- Guadalupe Comillo
- Gunnar Tonnisson
- Hal Tanaka
- Hannah's Secret
- Hannah Gruen
- Hannah Gruen (2019 character)
- Hannah Gruen (video game character)
- Harlan Bishop
- Harper Thornton
- Harriet Grosset
- Harry Houdini
- HeR Interactive
- Heart of Danger
- Heart of Ice
- Heather McKay
- Hector "Hulk" Sanchez
- Heerlijkheid
- Helen Corning
- Helena Berg
- Helfdan Helgason
- Henrik van der Hune
- Henry Bolet
- Her Interactive Kids
- Hidden Codes
- Hidden Meanings
- Hidden Pictures
- High Marks for Malice
- High Risk (Files)
- High Risk (Girl Detective)
- High Survival
- Hilda Swenson
- Hippocrates Bell
- Hit and Run Holiday
- Hits and Misses
- Hollywood Horror
- Holt Scotto
- Horseshoe Bay, Maine
- Hot Kettle Cafe
- Hot Pursuit
- Hot Tracks
- Hotline to Danger
- Hudson family
- Hue Straddenier
- Hugh Penvellyn
- Hugo Butterly
- Humans Against the Destruction of Illustrious Theaters (HADIT)
- Icicle Creek Lodge
- Identity Mystery Trilogy
- Identity Revealed
- Identity Theft
- If Looks Could Kill
- Illusions of Evil
- In Search of the Black Rose
- Inga & Trish
- Ingrid Corey
- Interfaces
- Into Thin Air
- Intrigue at the Grand Opera
- Intruder
- Irina Predoviciu
- Isabelle DuPont
- Isis
- Island of Secrets
- Islands of Intrigue
- It's No Joke
- Izzy Romero
- J. J. Thompson
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