1930s
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- The Secret of the Old Clock (1930)
- The Hidden Staircase (1930)
- The Bungalow Mystery (1930)
- The Mystery at Lilac Inn (1931)
- The Secret at 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)
- The Password to Larkspur Lane (1933)
- The Clue of the Broken Locket (1934)
- The Message in the Hollow Oak (1935)
- The Mystery of the Ivory Charm (1936)
- The Whispering Statue (1937)
- The Haunted Bridge (1937)
- The Clue of the Tapping Heels (1939)
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1940s
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- The Mystery of the Brass-Bound Trunk (1940)
- The Mystery at 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)
- The Mystery of the Tolling Bell (1946)
- The Clue in the Old Album (1947)
- The Ghost of Blackwood Bum (1948)
- The Clue of the Leaning Chimney (1949)
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1950s
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- The Secret of the Wooden Lady (1950)
- The Clue of the Black Keys (1951)
- The 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)
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1960s
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- 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)
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1970s
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- 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)
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1980s
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- 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)
- Race Against Time (1982)
- The Case of the Rising Stars (1988)
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1990s
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- The Treasure in the Royal Tower (1995)
- The Wedding Day Mystery (1997)
- The E-mail Mystery (1998)
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2000s
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- Werewolf in a Winter Wonderland (2003)
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