The asterisks following the titles are color-coded and indicate the books I personally own. I also have several copies without dustjackets that aren't indicated here.

1. The Secret of the Old Clock * R R *
2. The Hidden Staircase R R *
3. The Bungalow Mystery * R *
4. The Mystery at Lilac Inn * HH R *
5. The Secret at Shadow Ranch ***
6. The Secret of Red Gate Farm R *
7. The Clue in the Diary * R
8. Nancy's Mysterious Letter **
9. The Sign of the Twisted Candles **
10. The Password to Larkspur Lane **
11. The Clue of the Broken Locket ***
12. The Message in the Hollow Oak **
13. The Mystery of the Ivory Charm **
14. The Whispering Statue ***
15. The Haunted Bridge **
16. The Clue of the Tapping Heels *
17. The Mystery of the Brass Bound Trunk *
18. The Mystery of the Moss-Covered Mansion *
19. The Quest of the Missing Map *
20. The Clue in the Jewel Box *
21. The Secret in the Old Attic *
22. The Clue in the Crumbling Wall **
23. The Mystery of the Tolling Bell **
24. The Clue in the Old Album *
25. The Ghost of Blackwood Hall *
26. The Clue of the Leaning Chimney *
27. * The Secret of the Wooden Lady *
28. The Clue of the Black Keys *
29. The Mystery at the Ski Jump *
30. The Clue of the Velvet Mask **
31. The Ringmaster's Secret *
32. The Scarlet Slipper Mystery *
33. The Witch Tree Symbol ***
34. The Hidden Window Mystery *
35. The Haunted Showboat *
36. The Secret of the Golden Pavilion *
37. The Clue in the Old Stagecoach *
38. The Mystery of the Fire Dragon *
39. The Clue of the Dancing Puppet *C16
40. The Moonstone Castle Mystery *
41. The Clue of the Whistling Bagpipes *
42. The Phantom of Pine Hill *
43. The Mystery of the 99 Steps *
44. The Clue in the Crossword Cipher *
45. The Spider Sapphire Mystery *
46. The Invisible Intruder *
47. The Mysterious Mannequin *
48. The Crooked Banister *
49. The Secret of Mirror Bay *
50. The Double Jinx Mystery *
51. Mystery of the Glowing Eye *
52. The Secret of the Forgotten City *
53. The Sky Phantom **
54. The Strange Message in the Parchment *
55. Mystery of Crocodile Island *
56. The Thirteenth Pearl *

57. The Triple Hoax *
58. The Flying Saucer Mystery **
59. The Secret in the Old Lace **
60. The Greek Symbol Mystery *
61. The Swami's Ring *
62. The Kachina Doll Mystery *
63. The Twin Dilemma *
64. Captive Witness *
65. Mystery of the Winged Lion **
66. Race Against Time **
67. The Sinister Omen **
68. The Elusive Heiress *
69. Clue in the Ancient Disguise *
70. The Broken Anchor *
71. The Silver Cobweb *
72. The Haunted Carousel *
73. Enemy Match *
74. The Mysterious Image *
75. The Emerald-Eyed Cat *
76. * The Eskimo's Secret - 1985
77. The Bluebeard Room *
78. * The Phantom of Venice - 1985
79. The Double Horror of Fenley Place *
80. The Case of the Disappearing Diamonds *
81. Mardi Gras Mystery *
82. The Clue in the Camera *
83. The Case of the Vanishing Veil *
84. * The Joker's Revenge - 1988
85. * The Secret of Shady Glen - 1988
86. The Mystery of Misty Canyon *
87. The Case of the Rising Stars *
88. * The Search for Cindy Austin - 1988
89. The Case of the Disappearing Deejay *
90. The Puzzle at Pineview School *
91. The Girl Who Couldn't Remember *
92. The Ghost of Craven Cove *
93. The Case of the Safecracker's Secret *
94. The Picture-Perfect Mystery *
95. The Silent Suspect *
96. The Case of the Photo Finish *
97. The Mystery at Magnolia Mansion *
98. The Haunting of Horse Island *
99. * The Secret at Seven Rocks - 1991
100. A Secret in Time **
101. The Mystery of the Missing Millionaires *
102. * The Secret in the Dark - 1991
103. The Stranger in the Shadows *
104. The Mystery of the Jade Tiger *
105. The Clue in the Antique Trunk *
106. The Case of the Artful Crime *
107. The Legend of Miner's Creek *
108. The Secret of the Tibetan Treasure *
109. The Mystery of the Masked Rider *
110. The Nutcracker Ballet Mystery *
111. The Secret at Solaire *
112. Crime in the Queen's Court *
113. The Secret Lost at Sea *
114. The Search for the Silver Persian *
115. The Suspect in the Smoke *
116. The Case of the Twin Teddy Bears *
117. Mystery on the Menu *
118. Trouble at Lake Tahoe *
119. The Mystery of the Missing Mascot *
120. The Case of the Floating Crime *
121. The Fortune-Teller's Secret *
122. The Message in the Haunted Mansion *
123. The Clue on the Silver Screen *
124. * The Secret of the Scarlet Hand - 1995
125. The Teen Model Mystery *
126. * The Riddle in the Rare Book - 1995
127. The Case of the Dangerous Solution *
128. The Treasure in the Royal Tower *
129. The Baby-Sitter Burglaries *
130. The Sign of the Falcon *
131. The Hidden Inheritance *
132. * The Fox Hunt Mystery - 1996 (white)
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 *
139. * The Secret of Candlelight Inn - 1997
140. * The Door-To-Door Deception - 1997
141. * The Wild Cat Crime - 1997
142. * The Case of Capital Intrigue - 1998
143. * Mystery on Maui - 1998
144. The E-Mail Mystery *
145. * The Missing Horse Mystery - 1998
146. The Ghost of the Lantern Lady *
147. * The Case of the Captured Queen - 1999
148. * On the Trail of Trouble - 1999
149. * The Clue of the Gold Dubloons - 1999
150. * Mystery at Moorsea Manor - 1999
151. * The Chocolate-Covered Contest - 1999
152. * The Key in the Satin Pocket - 1999
153. * Whispers in the Fog - 2000
154. The Legend of the Emerald Lady *
155. * The Mystery in Tornado Alley - 2000
156. * The Secret in the Stars - 2000
157. The Music Festival Mystery *
158. The Curse of the Black Cat *
159. The Secret of the Fiery Chamber *

10601.   The Secret of the Old Clock
              The Hidden Staircase*
10602.   The Bungalow Mystery
              The Mystery at Lilac Inn*
10603.   The Secret of Shadow Ranch
              The Secret of Red Gate Farm*
10604.   The Clue in the Diary
              Nancy's Mysterious Letter*
10605.   The Sign of the Twisted Candles
              Password to Larkspur Lane*
10606.   The Clue of the Broken Locket
              The Message in the Hollow Oak*
10607.   The Mystery of the Ivory Charm
              The Whispering Statue*
10608.   The Haunted Bridge
              The Clue of the Tapping Heels*
10609.   The Mystery of the Moss-Covered Mansion
              The Quest of the Missing Map*
10610.   The Clue in the Jewel Box
              The Secret in the Old Attic*
10611.   The Clue in the Crumbling Wall
              Mystery of the Tolling Bell*
10612.   The Ghost of Blackwood Hall
              The Clue of the Leaning Chimney*
10613.   The Secret of the Wooden Lady
              The Clue of the Black Keys*
10614.   * Mystery at the Ski Jump
              The Clue of the Velvet Mask
10615.   The Ringmaster's Secret
              The Scarlet Slipper Mystery*
10616.   * The Haunted Showboat
              The Secret of the Golden Pavilion
10617.   The Clue in the Old Stagecoach
              The Mystery of the Fire Dragon*
10618.   The Clue of the Dancing Puppet
              The Moonstone Castle Mystery*
10619.   The Clue of the Whistling Bagpipes
              The Phantom of Pine Hill*
10620.   The Mystery of the 99 Steps
              The Clue in the Crossword Cipher*
10621.   The Spider Sapphire Mystery
              The Invisible Intruder*
10622.   The Mysterious Mannequin
              The Crooked Banister*
10623.   * The Secret of Mirror Bay
              The Double Jinx Mystery
10624.   Mystery of the Glowing Eye
              The Secret of the Forgotten City*
10625.   The Witch Tree Symbol
              The Hidden Window Mystery*
10626.   The Sky Phantom
              The Strange Message in the Parchment*
10627.   Mystery of the Brass Bound Trunk
              The Clue in the Old Album*
10628.   * Mystery of Crocodile Island
              The Thirteenth Pearl

1. Love Times Three *
2. Guilty Secrets *
3. Going Too Far *
4. Stolen Kisses *
5. Between the Lines **
6. Lessons in Love **
7. Cheating Hearts *
8. The Trouble with Love *
9. Lies and Whispers *
10. * Mixed Emotions
11. Broken Hearts *
12. Hard to Handle *
13. A Mind of Her Own *
14. Love and Games *
15. Friends and Rivals *
16. The Jealousy Trap *

• Junior Class Trip *

1. * Secrets Can Kill
2. Deadly Intent *
3. Murder on Ice *
4. Smile and Say Murder *
5. Hit and Run Holiday *
6. White Water Terror *
7. Deadly Doubles *
8. Two Points to Murder *
9. * False Moves
10. Buried Secrets *
11. Heart of Danger *
12. Fatal Ransom *
13. * Wings of Fear
14. This Side of Evil *
15. Trial By Fire *
16. Never Say Die *
17. Stay Tuned for Danger *
18. Circle of Evil *
19. Sisters in Crime *
20. Very Deadly Yours *
21. Recipe for Murder *
22. * Fatal Attraction
23. * Sinister Paradise
24. * Till Death Do Us Part
25. Rich and Dangerous *
26. Playing with Fire *
27. Most Likely to Die *
28. The Black Widow *
29. Pure Poison *
30. Death By Design *
31. Trouble in Tahiti **
32. High Marks for Malice *
33. Danger in Disguise *
34. Vanishing Act **
35. Bad Medicine *
36. Over the Edge *
37. * Last Dance
38. The Final Scene *
39. * The Suspect Next Door
40. Shadow of a Doubt *
41. * Something to Hide
42. The Wrong Chemistry *
43. False Impressions *
44. Scent of Danger *
45. Out of Bounds *
46. Win, Place or Die *
47. Flirting with Danger *
48. A Date with Deception *
49. Portrait in Crime *
50. Deep Secrets *
51. * A Model Crime
52. Danger for Hire *
53. Trail of Lies *
54. Cold as Ice *
55. * Don't Look Twice
56. Make No Mistake *
57. Into Thin Air *
58. Hot Pursuit *
59. High Risk *
60. Poison Pen *
61. Sweet Revenge *
62. Easy Marks *
63. Mixed Signals *
64. The Wrong Track *
65. Final Notes *
66. Tall, Dark and Deadly *
67. Nobody's Business *
68. Crosscurrents *
69. Running Scared *
70. Cutting Edge *
71. Hot Tracks *
72. Swiss Secrets *
73. Rendezvous in Rome *
74. Greek Odyssey *
75. A Talent for Murder *
76. The Perfect Plot *
77. Danger on Parade *
78. Update on Crime *
79. No Laughing Matter *
80. Power of Suggestion *
81. Making Waves *
82. Dangerous Relations *
83. Diamond Deceit *
84. Choosing Sides *
85. Sea of Suspicion *
86. Let's Talk Terror *
87. Moving Target *
88. False Pretenses *
89. Designs in Crime *
90. Stage Fright *
91. If Looks Could Kill *
92. My Deadly Valentine *
93. Hotline to Danger *
94. Illusions of Evil *
95. An Instinct for Trouble *
96. The Runaway Bride *
97. Squeeze Play *
98. Island of Secrets *
99. The Cheating Heart *
100. Dance Till You Die *
101. * The Picture of Guilt
102. * Counterfeit Christmas
103. * Heart of Ice
104. * Kiss and Tell
105. * Stolen Affections
106. * Flying Too High
107. * Anything for Love
108. * Captive Heart
109. * Love Notes
110. * Hidden Meanings
111. * The Stolen Kiss
112. * For Love or Money
113. * Wicked Ways
114. * Rehearsing For Romance
115. * Running Into Trouble
116. * Under His Spell
117. * Skipping a Beat
118. * Betrayed By Love
119. * Against the Rules
120. * Dangerous Loves
121. * Natural Enemies
122. * Strange Memories
123. * Wicked for the Weekend
124. * Crime at the Chat Cafe

1. The Slumber Party Secret *
2. The Lost Locket *
3. The Secret Santa *
4. Bad Day for Ballet *
5. * The Soccer Shoe Club
6. The Ice Cream Scoop *
7. Trouble at Camp Treehouse *
8. The Best Detective *
9. The Thanksgiving Surprise *
10. Not Nice on Ice *
11. The Pen Pal Puzzle *
12. The Puppy Problem *
13. The Wedding Gift Goof *
14. * The Funny Face Fight
15. * The Crazy Key Clue
16. * The Ski Slope Mystery
17. * Whose Pet is Best?
18. * The Stolen Unicorn
19. * The Lemonade Raid
20. * Hannah's Secret
21. * Princess on Parade
22. * The Clue in the Glue
23. * Alien in the Classroom
24. * The Hidden Treasures
25. * Dare at the Fair
26. * The Lucky Horseshoes
27. * Trouble Takes the Cake
28. * Thrill on the Hill
29. * Lights, Camera, Clues
30. * It's No Joke!
31. * The Fine-Feathered Mystery
32. * The Black Velvet Mystery

1. New Lives, New Loves *
2. On Her Own *
3. Don't Look Back *
4. Tell Me the Truth *
5. Secret Rules *
6. It's Your Move *
7. False Friends *
8. Getting Closer *
9. Broken Promises *
10. Party Weekend *
11. In the Name of Love *
12. * Just the Two of Us
13. Campus Exposures *
14. Hard to Get *
15. Loving and Losing *
16. * Going Home
17. New Beginnings *
18. Keeping Secrets *
19. Love On-Line *
20. * Jealous Feelings
21. * Love and Betrayal
22. * In and Out of Love
23. * Otherwise Engaged
24. In the Spotlight *
25. Snowbound *