Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | Friday Barnes, Girl Detective | 2014 | R.A. Spratt | N/A |
| 2 | Girl Detective | 2014 | R.A. Spratt | Buy |
| 3 | Under Suspicion | 2019 | R.A. Spratt | Buy |
| 4 | Big Trouble | 2019 | R.A. Spratt | Buy |
| 5 | No Rules | 2019 | R.A. Spratt | Buy |
| 6 | The Plot Thickens | 2020 | R.A. Spratt | Buy |
| 7 | Danger Ahead | 2020 | R.A. Spratt | Buy |
| 8 | Bitter Enemies | 2021 | R.A. Spratt | Buy |
| 9 | Never Fear | 2021 | R.A. Spratt | Buy |
| 10 | No Escape | 2021 | R.A. Spratt | Buy |
| 11 | Undercover | 2022 | R.A. Spratt | Buy |
| 12 | Friday Barnes 11: Last Chance | 2023 | R.A. Spratt | N/A |
| 13 | Last Chance | 2023 | R.A. Spratt | Buy |
| 14 | Collision Course | 2024 | R.A. Spratt | Buy |
| 15 | In Plain Sight | 2025 | R.A. Spratt | Buy |
Friday Barnes is R.A. Spratt’s longest-running series, following a teenage genius who wins a scholarship to Highcrest Academy and quickly becomes its unofficial detective. Starting with Friday Barnes, Girl Detective (2014), the series spans fifteen books through In Plain Sight (2025).
Friday uses her formidable intelligence and deductive reasoning to solve mysteries at the school, from petty theft to larger conspiracies. The series balances genuine mystery plotting with Spratt’s trademark humor, making it popular with middle grade readers who enjoy smart, unconventional heroines.