What is the twentieth book in the Nancy Drew series?
The Vanishing Statue
Nancy Drew and the Hidden Staircase
Nancy Drew and the Hidden Staircase
Nancy Drew and the Hidden Staircase
The Secret of the Old Clock
The Hidden Staircase
Nancy Drew and the Hidden Staircase
The Hidden Staircase
The Secret of the Old Clock
Nancy Drew and the Hidden Staircase
The Mystery of the Blue Train
The Hidden Staircase
Nancy Drew and the Hidden Stuff
The Secret of the Old Clock
Hidden Treasures of the Amazon Jungle
Nancy Drew and the Hidden Staircase
Nancy Drew and the Hidden Stash
The Hidden Staircase
The Mystery of the Blue Train
Dangerous Curves
The Mystery of the Black Cat
Hidden Treasures of the Sierra Madre
Hidden Staircase
The Mystery of the Phantom Train
Hidden Treasures of the Amazon Jungle
Nancy Drew and the Hidden Stuff
The Hidden Staircase
Hidden Treasures of the Caribbean
Nancy Drew and the Hidden Staircase
The Secret of the Old Clock
Nancy Drew and the Hidden Stash
Dangerous Curves
Hidden Staircase
Hidden Treasures of the Sierra Madre
The Mystery of the Blue Train
Hidden Treasures of the Amazon Jungle
The Hidden Staircase
Hidden Treasures of the Caribbean
Nancy Drew and the Hidden Stuff
Dangerous Curves
Hidden Staircase
Nancy Drew and the Hidden Staircase
Never Say Die
Hidden Treasures of the Sierra Madre
Nancy Drew and the Hidden Stash
The Secret of the Old Clock
Hidden Treasures of the Amazon
Secret of the Old Clock
Hidden Treasures of the Amazon Jungle
The Hidden Staircase
Nightmare on 13th Street
Hidden Treasures of the Caribbean
The Mystery of the Blue Train
Hidden Staircase
Nightmare at Shadow Woods
Dangerous Curves
Never Say Die
Hidden Treasures of the Sierra Madre
Nancy Drew and the Hidden Stuff
Hidden Treasures of the Amazon
Nightmare on Elm Street
Nancy Drew and the Hidden Staircase
Nancy Drew and the Hidden Stash
The Hidden Staircase
Hidden Treasures of the Amazon Jungle
Secret of the Old Clock
The Secret of the Old Clock
Hidden Treasures of the Caribbean
Nightmare on 13th Street
Never Say Die
Hidden Staircase
Dangerous Curves
Dangerous Currency
Nightmare at Shadow Woods
Hidden Treasures of the Sierra Madre
Hidden Treasures of the Amazon
The Mystery of the Blue Train
Nightmare at Lakewood Manor
Nightmare on Elm Street
The Hidden Staircase
Nancy Drew and the Hidden Stuff
Nancy Drew and the Hidden Staircase
Secret of the Scarlet Hand
Hidden Treasures of the Amazon Jungle
Nightmare at Camp Lakeview
Never Say Die
Hidden Treasures of the Caribbean
Hidden Staircase
Nancy Drew and the Hidden Stash
Secret of the Old Clock
Nightmare on 13th Street
Dangerous Currency
Dangerous Curves
The Dark Secret of Harvest Home
The Secret of the Old Clock
Hidden Treasures of the Sierra Madre
Hidden Treasures of the Sierras
Nightmare at Shadow Woods
Hidden Treasures of the Amazon
Hidden Staircase, Hidden Treasure
Nightmare at Lakewood Manor
The Hidden Staircase
Mystery at the Villa Rose
Double Trouble
Nancy Drew and the Hidden Staircase
Never Say Die
Hidden Treasures of the Amazon Jungle
Nightmare on Elm Street
Hidden Treasures of the Caribbean
Hidden Staircase
Dead Man's Curve
Nancy Drew and the Hidden Stuff
Dangerous Currency
Nightmare at Camp Lakeview
Mystery at the Mansion
Dangerous Curves
Nightmare at Shadow Wood
Hidden Treasures
Mystery in the Mansion
Secret of the Old Clock
Nightmare on 13th Street
The Clue in the Mirror
Nancy Drew and the Hidden Stash
Hidden Staircase, Hidden Treasures
The Clue in the Tunnel
Hidden Treasures of the Amazon
Hidden Treasures of the Sierra Madre
Double Trouble
Nightmare at Shadow Woods
Hidden Staircase, Hidden Treasure
Never Say Die
The Hidden Staircase
Nightmare on 13th St.
Nancy Drew's Deadly Secret
The Secret of the Old Clock
Hidden Staircase
Hidden Treasures of the Amazon Jungle
Mystery at the Hotel Cortez
Hidden Treasures of the Caribbean
Nancy Drew and the Hidden Staircase
Nancy Drew's Deadly Curve
Dangerous Currency
Nightmare on Elm Street
Hidden Treasures
Secret of the Scarlet Slipper
Mystery at the Villa Rose
The Dark Secret of Harvest Home
Nightmare at Camp Lakeview
Secret of the Scarlet Handkerchief
Nightmare at Shadow Wood
Hidden Stuff
Dead Man's Curve
Double Trouble
Dangerous Curves
The Secret of Hidden Lake
Nancy Drew and the Hidden Stuff
Nightmare in Silver Falls
Secret of the Old Clock
Hidden Staircase, Hidden Treasures
Nightmare on 13th Street
Dead Man's Chest
Mystery at the Mansion
Hidden Treasures of the Amazon
Never Say Die
Hidden Treasures of the Sierra Madre
Girl on a Runaway Train
The Hidden Staircase
Nancy Drew's Deadly Secrets
Nightmare at Shadow Woods
Hidden Staircase, Hidden Treasure
Dangerous Liaisons
Nightmare in Silver
Hidden Staircase
Nancy Drew's Deadly Secret
Hidden Treasures of the Amazon Jungle
Dangerous Currency
Hidden Treasures of the Caribbean
Mystery in the Mansion
Nancy Drew and the Hidden Staircase
Dead Man's Ransom
Nancy Drew's Deadly Curve
Nightmare in Silver Lake
Nightmare on 13th St.
Double Trouble
Nightmare at Camp Lakeview
Nightmare at Shadow Wood
Nightmare on Elm Street
Nightmare at the Villa Rose
Deadly Duchess
Dead Man's Curve
Nightmare in Silver Falls
Girl on a Swing
Never Say Die
Mystery at the Villa Rose
Nancy Drew: Mystery in the Mansion
Hidden Treasures of the Amazon
Hidden Treasures of the Sierra Madre
The Hidden Staircase
Hidden Stuff
Dangerous Curves
Nancy Drew and the Hidden Stuff