| # | Book Title | Author | |
|---|---|---|---|
| 1 | Forest Slump: the Case of the Pilfered Pine Needles | Lloyd, Emily | |
| 2 | Hot-Tempered Farmers: the Case of the Barbecued Barns | Harwood, Chuck | |
| 3 | One Norse Town: the Case of the Suspicious Scrolls | Warner, J. A. | |
| 4 | Catch of the Day: the Case of the Helpless Humpbacks | Lloyd, Emily | |
| 5 | Metal Heads: the Case of the Rival Robots | Meyer, Marianne | |
| 6 | Tall Tales: the Case of the Growing Suspicions | Lloyd, Emily | |
| 7 | Rock the House: the Case of the Meteorite Menace | Harwood, Chuck | |
| 8 | This School Stinks: the Case of the Secret Scent | Warner, J. A. | |
| 9 | Snow Problem: the Case of the Mushing Madness | Meyer, Marianne | |
| 10 | Truffle Trouble: the Case of the Fungus Among Us | Lloyd, Emily | |
| 11 | Home Run Has-Been: the Case of the Sluggish Slugger | Lloyd, Emily | |
| 12 | U. F. Uh-Oh!: the Case of the Mayor's Martians | Warner, J. A. | |
| 13 | Bowled Over: The Case of the Gravity Goof-Up | Harwood, Chuck |