| # | Book Title | Author | |
|---|---|---|---|
| 1 | Secret of Jungle Park, The | Hope, Laura Lee | |
| 2 | Case of the Runaway Money, The | Hope, Laura Lee | |
| 3 | Clue That Flew Away, The | Hope, Laura Lee | |
| 4 | Secret in the Sand Castle, The | Hope, Laura Lee | |
| 5 | Case of the Close Encounter, The | Hope, Laura Lee | |
| 6 | Mystery on the Mississippi | Hope, Laura Lee | |
| 7 | Trouble in Toyland | Hope, Laura Lee | |
| 8 | Secret of the Stolen Puppies, The | Hope, Laura Lee | |
| 9 | Clue in the Classroom, The | Hope, Laura Lee | |
| 10 | Chocolate-Covered Clue, The | Hope, Laura Lee | |
| 11 | Case of the Crooked Contest, The | Hope, Laura Lee | |
| 12 | Secret of the Sunken Treasure, The | Hope, Laura Lee | |
| 13 | Case of the Crying Clown, The | Hope, Laura Lee | |
| 14 | Mystery of the Missing Mummy, The | Hope, Laura Lee | |
| 15 | Secret of the Stolen Clue, The | Hope, Laura Lee | |
| 16 | Case of the Disappearing Dinosaur, The | Hope, Laura Lee | |
| 17 | Case at Creepy Castle, The | Hope, Laura Lee | |
| 18 | Secret at Sleepaway Camp, The | Hope, Laura Lee | |
| 19 | Show-and-Tell Mystery, The | Hope, Laura Lee | |
| 20 | Weird Science Mystery, The | Hope, Laura Lee | |
| 21 | Great Skate Mystery, The | Hope, Laura Lee | |
| 22 | Super-Duper Cookie Caper, The | Hope, Laura Lee | |
| 23 | Monster Mouse Mystery, The | Hope, Laura Lee | |
| 24 | Case of the Goofy Game Show, The | Hope, Laura Lee | |
| 25 | Case of the Crazy Collections, The | Hope, Laura Lee | |
| 26 | Clue at Casper Creek, The | Hope, Laura Lee | |
| 27 | Big Pig Puzzle, The | Hope, Laura Lee | |
| 28 | Case of the Vanishing Video, The | Hope, Laura Lee | |
| 29 | Case of the Tricky Trickster, The | Hope, Laura Lee | |
| 30 | Mystery of the Mixed-Up Mail, The | Hope, Laura Lee |