| # | Title Avg. |
Year |
Book Link |
|---|
| 1 | 9.6 The Secret of the Old Clock | 1930 | |
| 2 | The Hidden Staircase | 1930 | |
| 3 | The Bungalow Mystery | 1930 | |
| 4 | The Mystery at Lilac Inn | 1930 | |
| 5 | The Secret of Shadow Ranch | 1931 | |
| 6 | The Secret of Red Gate Farm | 1931 | |
| 7 | The Clue in the Diary | 1932 | |
| 8 | Nancy's Mysterious Letter | 1932 | |
| 9 | The Sign of the Twisted Candles | 1933 | |
| 10 | Password to Larkspur Lane | 1933 | |
| 11 | The Clue of the Broken Locket | 1934 | |
| 12 | The Message in the Hollow Oak | 1935 | |
| 13 | The Mystery of the Ivory Charm | 1936 | |
| 14 | The Whispering Statue | 1937 | |
| 15 | The Haunted Bridge | 1937 | |
| 16 | The Clue of the Tapping Heels | 1939 | |
| 17 | Mystery of the Brass-Bound Trunk | 1940 | |
| 18 | Mystery of the Moss-Covered Mansion | 1941 | |
| 19 | The Quest of the Missing Map | 1942 | |
| 20 | The Clue in the Jewel Box | 1943 | |
| 21 | The Secret in the Old Attic | 1944 | |
| 22 | The Clue in the Crumbling Wall | 1945 | |
| 23 | Mystery of the Tolling Bell | 1946 | |
| 24 | The Clue in the Old Album | 1947 | |
| 25 | The Ghost of Blackwood Hall | 1948 | |
| 26 | The Clue of the Leaning Chimney | 1949 | |
| 27 | The Secret of the Wooden Lady | 1950 | |
| 28 | The Clue of the Black Keys | 1951 | |
| 29 | Mystery at the Ski Jump | 1952 | |
| 30 | The Clue of the Velvet Mask | 1953 | |
| 31 | The Ringmaster's Secret | 1953 | |
| 32 | The Scarlet Slipper Mystery | 1954 | |
| 33 | The Witch Tree Symbol | 1955 | |
| 34 | The Hidden Window Mystery | 1956 | |
| 35 | The Haunted Showboat | 1957 | |
| 36 | The Secret of the Golden Pavilion | 1959 | |
| 37 | The Clue in the Old Stagecoach | 1960 | |
| 38 | The Mystery of the Fire Dragon | 1961 | |
| 39 | The Clue of the Dancing Puppet | 1962 | |
| 40 | The Moonstone Castle Mystery | 1963 | |
| 41 | The Clue of the Whistling Bagpipes | 1964 | |
| 42 | The Phantom of Pine Hill | 1965 | |
| 43 | The Mystery of the 99 Steps | 1966 | |
| 44 | The Clue in the Crossword Cipher | 1967 | |
| 45 | The Spider Sapphire Mystery | 1968 | |
| 46 | The Invisible Intruder | 1969 | |
| 47 | The Mysterious Mannequin | 1970 | |
| 48 | The Crooked Banister | 1971 | |
| 49 | The Secret of Mirror Bay | 1972 | |
| 50 | The Double Jinx Mystery | 1973 | |
| 51 | Mystery of the Glowing Eye | 1974 | |
| 52 | The Secret of the Forgotten City | 1975 | |
| 53 | The Sky Phantom | 1976 | |
| 54 | The Strange Message in the Parchment | 1977 | |
| 55 | Mystery of Crocodile Island | 1978 | |
| 56 | The Thirteenth Pearl | 1979 | |
| 57 | The Triple Hoax | 1979 | |
| 58 | The Flying Saucer Mystery | 1980 | |
| 59 | The Secret in the Old Lace | 1980 | |
| 60 | The Greek Symbol Mystery | 1980 | |
| 61 | The Swami's Ring | 1981 | |
| 62 | The Kachina Doll Mystery | 1981 | |
| 63 | The Twin Dilemma | 1981 | |
| 64 | Captive Witness | 1981 | |
| 65 | Mystery of the Winged Lion | 1982 | |
| 66 | Race Against Time | 1982 | |
| 67 | The Sinister Omen | 1982 | |
| 68 | The Elusive Heiress | 1982 | |
| 69 | Clue in the Ancient Disguise | 1982 | |
| 70 | The Broken Anchor | 1983 | |
| 71 | The Silver Cobweb | 1983 | |
| 72 | The Haunted Carousel | 1983 | |
| 73 | Enemy Match | 1984 | |
| 74 | The Mysterious Image | 1984 | |
| 75 | The Emerald-Eyed Cat Mystery | 1984 | |
| 76 | The Eskimo's Secret | 1985 | |
| 77 | The Bluebeard Room | 1985 | |
| 78 | The Phantom of Venice | 1985 | |
| 79 | The Double Horror of Fenley Place | 1987 | |
| 80 | The Case of the Disappearing Diamonds | 1987 | |
| 81 | The Mardi Gras Mystery | 1988 | |
| 82 | The Clue in the Camera | 1988 | |
| 83 | The Case of the Vanishing Veil | 1988 | |
| 84 | The Joker's Revenge | 1988 | |
| 85 | The Secret of Shady Glen | 1988 | |
| 86 | The Mystery of Misty Canyon | 1988 | |
| 87 | The Case of the Rising Star | 1989 | |
| 88 | The Search for Cindy Austin | 1989 | |
| 89 | The Case of the Disappearing Deejay | 1989 | |
| 90 | The Puzzle at Pineview School | 1989 | |
| 91 | The Girl Who Couldn't Remember | 1989 | |
| 92 | The Ghost of Craven Cove | 1989 | |
| 93 | The Case of the Safecracker's Secret | 1990 | |
| 94 | The Picture Perfect Mystery | 1990 | |
| 95 | The Silent Suspect | 1990 | |
| 96 | The Case of the Photo Finish | 1990 | |
| 97 | The Mystery at Magnolia Mansion | 1990 | |
| 98 | The Haunting of Horse Island | 1990 | |
| 99 | The Secret at Seven Rocks | 1991 | |
| 100 | A Secret in Time | 1991 | |
| 101 | The Mystery of the Missing Millionairess | 1991 | |
| 102 | The Secret in the Dark | 1991 | |
| 103 | The Stranger in the Shadows | 1991 | |
| 104 | The Mystery of the Jade Tiger | 1991 | |
| 105 | The Clue in the Antique Trunk | 1992 | |
| 106 | The Case of the Artful Crime | 1992 | |
| 107 | The Legend of Miner's Creek | 1992 | |
| 108 | The Secret of the Tibetan Treasure | 1992 | |
| 109 | The Mystery of the Masked Rider | 1992 | |
| 110 | The Nutcracker Ballet Mystery | 1992 | |
| 111 | The Secret at Solaire | 1993 | |
| 112 | Crime in the Queen's Court | 1993 | |
| 113 | The Secret Lost at Sea | 1993 | |
| 114 | The Search for the Silver Persian | 1993 | |
| 115 | The Suspect in the Smoke | 1993 | |
| 116 | The Case of the Twin Teddy Bears | 1993 | |
| 117 | Mystery on the Menu | 1994 | |
| 118 | Trouble at Lake Tahoe | 1994 | |
| 119 | The Mystery of the Missing Mascot | 1994 | |
| 120 | The Case of the Floating Crime | 1994 | |
| 121 | The Fortune Teller's Secret | 1994 | |
| 122 | The Message in the Haunted Mansion | 1994 | |
| 123 | The Clue on the Silver Screen | 1995 | |
| 124 | The Secret of the Scarlet Hand | 1995 | |
| 125 | The Teen Model Mystery | 1995 | |
| 126 | The Riddle in the Rare Book | 1995 | |
| 127 | The Case of the Dangerous Solution | 1995 | |
| 128 | The Treasure in the Royal Tower | 1995 | |
| 129 | The Baby-Sitter Burglaries | 1996 | |
| 130 | The Sign of the Falcon | 1996 | |
| 131 | The Hidden Inheritance | 1996 | |
| 132 | The Fox Hunt Mystery | 1996 | |
| 133 | The Mystery at the Crystal Palace | 1996 | |
| 134 | The Secret of the Forgotten Cave | 1996 | |
| 135 | The Riddle of the Ruby Gazelle | 1997 | |
| 136 | The Wedding Day Mystery | 1997 | |
| 137 | In Search of the Black Rose | 1997 | |
| 138 | The Legend of the Lost Gold | 1997 | |
| 139 | The Secret of Candlelight Inn | 1997 | |
| 140 | The Door-to-Door Deception | 1997 | |
| 141 | The Wild Cat Crime | 1998 | |
| 142 | The Case of Capital Intrigue | 1998 | |
| 143 | Mystery on Maui | 1998 | |
| 144 | The E-Mail Mystery | 1998 | |
| 145 | The Missing Horse Mystery | 1998 | |
| 146 | The Ghost of the Lantern Lady | 1998 | |
| 147 | The Case of the Captured Queen | 1999 | |
| 148 | On the Trail of Trouble | 1999 | |
| 149 | The Clue of the Gold Doubloons | 1999 | |
| 150 | Mystery at Moorsea Manor | 1999 | |
| 151 | The Chocolate-Covered Contest | 1999 | |
| 152 | The Key in the Satin Pocket | 2000 | |
| 153 | Whispers in the Fog | 2000 | |
| 154 | The Legend of the Emerald Lady | 2000 | |
| 155 | The Mystery in Tornado Alley | 2000 | |
| 156 | The Secret in the Stars | 2000 | |
| 157 | The Music Festival Mystery | 2000 | |
| 158 | The Curse of the Black Cat | 2001 | |
| 159 | The Secret of the Fiery Chamber | 2001 | |
| 160 | The Clue on the Crystal Dove | 2001 | |
| 161 | Lost in the Everglades | 2001 | |
| 162 | The Case of the Lost Song | 2001 | |
| 163 | The Clues Challenge | 2001 | |
| 164 | The Mystery of the Mother Wolf | 2002 | |
| 165 | The Crime Lab Case | 2002 | |
| 166 | The Case of the Creative Crime | 2002 | |
| 167 | Mystery by Moonlight | 2002 | |
| 168 | The Bike Tour Mystery | 2002 | |
| 169 | The Mistletoe Mystery | 2002 | |
| 170 | No Strings Attached | 2003 | |
| 171 | Intrigue at the Grand Opera | 2003 | |
| 172 | The Riding Club Crime | 2003 | |
| 173 | Danger on the Great Lakes | 2003 | |
| 174 | A Taste of Danger | 2003 | |
| 175 | Werewolf in a Winter Wonderland | 2003 | |