The Secret of the Old Clock | (1930) |    |
The Hidden Staircase | (1930) |    |
The Bungalow Mystery | (1930) |    |
The Mystery at Lilac Inn | (1930) |    |
The Secret of Shadow Ranch | (1931) |    |
The Secret of Red Gate Farm | (1931) |    |
The Clue in the Diary | (1932) |    |
Nancy's Mysterious Letter | (1932) |    |
The Sign of the Twisted Candles | (1933) |    |
Password to Larkspur Lane | (1933) |    |
The Clue of the Broken Locket | (1934) |    |
The Message in the Hollow Oak | (1935) |    |
Mystery of the Ivory Charm | (1936) |    |
The Whispering Statue | (1937) |    |
The Haunted Bridge | (1937) |    |
The Clue of the Tapping Heels | (1939) |    |
Mystery of the Brass-Bound Trunk | (1940) |    |
Mystery of the Moss-Covered Mansion | (1941) |    |
The Quest of the Missing Map | (1942) |    |
The Clue in the Jewel Box | (1943) |    |
The Secret in the Old Attic | (1944) |    |
The Clue in the Crumbling Wall | (1945) |    |
Mystery of the Tolling Bell | (1946) |    |
The Clue in the Old Album | (1947) |    |
The Ghost of Blackwood Hall | (1948) |    |
The Clue of the Leaning Chimney | (1949) |    |
The Secret of the Wooden Lady | (1950) |    |
The Clue of the Black Keys | (1951) |    |
Mystery at the Ski Jump | (1952) |    |
The Clue of the Velvet Mask | (1953) |    |
The Ringmaster's Secret | (1953) |    |
The Scarlet Slipper Mystery | (1954) |    |
The Witch Tree Symbol | (1955) |    |
The Hidden Window Mystery | (1956) |    |
The Haunted Showboat | (1957) |    |
The Secret of the Golden Pavilion | (1959) |    |
The Clue in the Old Stagecoach | (1960) |    |
The Mystery of the Fire Dragon | (1961) |    |
The Clue of the Dancing Puppet | (1962) |    |
The Moonstone Castle Mystery | (1963) |    |
The Clue of the Whistling Bagpipes | (1964) |    |
The Phantom of Pine Hill | (1965) |    |
The Mystery of the 99 Steps | (1966) |    |
The Clue in the Crossword Cipher | (1967) |    |
The Spider Sapphire Mystery | (1968) |    |
The Invisible Intruder | (1969) |    |
The Mysterious Mannequin | (1970) |    |
The Crooked Banister | (1971) |    |
The Secret of Mirror Bay | (1972) |    |
The Double Jinx Mystery | (1973) |    |
Mystery of the Glowing Eye | (1974) |    |
The Secret of the Forgotten City | (1975) |    |
The Sky Phantom | (1976) |    |
The Strange Message in the Parchment | (1977) |    |
Mystery of Crocodile Island | (1978) |    |
The Thirteenth Pearl | (1979) |    |
The Triple Hoax | (1979) |    |
The Flying Saucer Mystery | (1980) |    |
The Secret in the Old Lace | (1980) |    |
The Greek Symbol Mystery | (1980) |    |
The Swami's Ring | (1981) |    |
The Kachina Doll Mystery | (1981) |    |
The Twin Dilemma | (1981) |    |
Captive Witness | (1981) |    |
Mystery of the Winged Lion | (1982) |    |
Race Against Time | (1982) |    |
The Sinister Omen | (1982) |    |
The Elusive Heiress | (1982) |    |
Clue in the Ancient Disguise | (1982) |    |
The Broken Anchor | (1983) |    |
The Silver Cobweb | (1983) |    |
The Haunted Carousel | (1983) |    |
Enemy Match | (1984) |    |
The Mysterious Image | (1984) |    |
The Emerald-Eyed Cat Mystery | (1984) |    |
The Eskimo's Secret | (1985) |    |
The Bluebeard Room | (1985) |    |
The Phantom of Venice | (1985) |    |
The Double Horror of Fenley Place | (1987) |    |
The Case of the Disappearing Diamonds | (1987) |    |
The Mardi Gras Mystery | (1988) |    |
The Clue in the Camera | (1988) |    |
The Case of the Vanishing Veil | (1988) |    |
The Joker's Revenge | (1988) |    |
The Secret of Shady Glen | (1988) |    |
The Mystery of Misty Canyon | (1988) |    |
The Case of the Rising Star | (1989) |    |
The Search for Cindy Austin | (1989) |    |
The Case of the Disappearing Deejay | (1989) |    |
The Puzzle at Pineview School | (1989) |    |
The Girl Who Couldn't Remember | (1989) |    |
The Ghost of Craven Cove | (1989) |    |
The Case of the Safecracker's Secret | (1990) |    |
The Picture Perfect Mystery | (1990) |    |
The Silent Suspect | (1990) |    |
The Case of the Photo Finish | (1990) |    |
The Mystery at Magnolia Mansion | (1990) |    |
The Haunting of Horse Island | (1990) |    |
The Secret at Seven Rocks | (1991) |    |
A Secret in Time | (1991) |    |
The Mystery of the Missing Millionairess | (1991) |    |
The Secret in the Dark | (1991) |    |
The Stranger in the Shadows | (1991) |    |
The Mystery of the Jade Tiger | (1991) |    |
The Clue in the Antique Trunk | (1992) |    |
The Case of the Artful Crime | (1992) |    |
The Legend of Miner's Creek | (1992) |    |
The Secret of the Tibetan Treasure | (1992) |    |
The Mystery of the Masked Rider | (1992) |    |
The Nutcracker Ballet Mystery | (1992) |    |
The Secret at Solaire | (1993) |    |
Crime in the Queen's Court | (1993) |    |
The Secret Lost at Sea | (1993) |    |
The Search for the Silver Persian | (1993) |    |
The Suspect in the Smoke | (1993) |    |
The Case of the Twin Teddy Bears | (1993) |    |
Mystery on the Menu | (1994) |    |
Trouble at Lake Tahoe | (1994) |    |
The Mystery of the Missing Mascot | (1994) |    |
The Case of the Floating Crime | (1994) |    |
The Fortune Teller's Secret | (1994) |    |
The Message in the Haunted Mansion | (1994) |    |
The Clue on the Silver Screen | (1995) |    |
The Secret of the Scarlet Hand | (1995) |    |
The Teen Model Mystery | (1995) |    |
The Riddle in the Rare Book | (1995) |    |
The Case of the Dangerous Solution | (1995) |    |
The Treasure in the Royal Tower | (1995) |    |
The Baby-Sitter Burglaries | (1996) |    |
The Sign of the Falcon | (1996) |    |
The Hidden Inheritance | (1996) |    |
The Fox Hunt Mystery | (1996) |    |
The Mystery at the Crystal Palace | (1996) |    |
The Secret of the Forgotten Cave | (1996) |    |
The Riddle of the Ruby Gazelle | (1997) |    |
The Wedding Day Mystery | (1997) |    |
In Search of the Black Rose | (1997) |    |
The Legend of the Lost Gold | (1997) |    |
The Secret of Candlelight Inn | (1997) |    |
The Door-to-Door Deception | (1997) |    |
The Wild Cat Crime | (1998) |    |
The Case of Capital Intrigue | (1998) |    |
Mystery on Maui | (1998) |    |
The E-Mail Mystery | (1998) |    |
The Missing Horse Mystery | (1998) |    |
The Ghost of the Lantern Lady | (1998) |    |
The Case of the Captured Queen | (1999) |    |
On the Trail of Trouble | (1999) |    |
The Clue of the Gold Doubloons | (1999) |    |
Mystery at Moorsea Manor | (1999) |    |
The Chocolate-Covered Contest | (1999) |    |
The Key in the Satin Pocket | (2000) |    |
Whispers in the Fog | (2000) |    |
The Legend of the Emerald Lady | (2000) |    |
The Mystery in Tornado Alley | (2000) |    |
The Secret in the Stars | (2000) |    |
The Music Festival Mystery | (2000) |    |
The Curse of the Black Cat | (2001) |    |
The Secret of the Fiery Chamber | (2001) |    |
The Clue on the Crystal Dove | (2001) |    |
Lost in the Everglades | (2001) |    |
The Case of the Lost Song | (2001) |    |
The Clues Challenge | (2001) |    |
The Mystery of the Mother Wolf | (2002) |    |
The Crime Lab Case | (2002) |    |
The Case of the Creative Crime | (2002) |    |
Mystery by Moonlight | (2002) |    |
The Bike Tour Mystery | (2002) |    |
The Mistletoe Mystery | (2002) |    |
No Strings Attached | (2003) |    |
Intrigue at the Grand Opera | (2003) |    |
The Riding Club Crime | (2003) |    |
Danger on the Great Lakes | (2003) |    |
A Taste of Danger | (2003) |    |
Werewolf in a Winter Wonderland | (2003) |    |