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Private Investigators (Mystery, Books): Amazon KDP category data
Amazon Books Best Sellers data for Private Investigators (Mystery, Books), updated Nov 3, 2026: median price $11.04, median 9,851 reviews, average rating 4.5 and a KDPTop opportunity score of 20/100 (highly competitive).
| Price range (middle 50%) | $5.99 – $16.74 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 15% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its review barrier is higher than in 99% of Books categories: the median best seller has 9,851 reviews, so new books need time to build up.
- At $11.04 its median price is below 86% of Books categories, so it is a volume game.
- 15% of its best sellers came out in the last 90 days, more than in 80% of Books categories: readers here keep buying new titles.
Top 10 Private Investigators best sellers
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The Girl in the Lake: A Holmes, Margaret & Poe Mystery
- List rank#2
- Price$14.99
- Rating4.4
- Reviews167
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Swamp Shoot (Miss Fortune Mysteries Book 31)
by Jana DeLeon
- List rank#4
- Price$7.99
- Rating4.8
- Reviews2,855
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Her Father's Lies (Darcy Hunt FBI Mystery Suspense Thriller Book 12)
by Eva Sparks
- List rank#5
- Price$5.99
- Rating4.4
- Reviews20
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Winner Takes All - A Cosy Crime Series: Cherringham, Band 51
by Matthew Costello
- List rank#6
- Price$4.76
- Rating4.6
- Reviews113
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Find Me Nowhere
- List rank#10
- Price$18.69
- Rating5.0
- Reviews36
Same niche in Kindle eBooks: Private Investigators
FAQ
Is Private Investigators a good niche for Amazon KDP?
Its KDPTop opportunity score is 20/100, which makes it highly competitive. The median best seller has 9,851 reviews and sells for $11.04.
How many reviews do you need to rank in Private Investigators?
The median best seller has 9,851 reviews, and 7% of them have fewer than 100.
What do Private Investigators best sellers cost?
The median price is $11.04; half of the best sellers are priced between $5.99 and $16.74.
Can new books break into Private Investigators?
15% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.