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Spies (Mysteries & Detectives, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Spies (Mysteries & Detectives, Kindle eBooks), updated Nov 3, 2026: median price $8.99, median 1,397 reviews, average rating 4.7 and a KDPTop opportunity score of 18/100 (highly competitive).
| Price range (middle 50%) | $6.99 – $9.99 |
|---|---|
| Average rating | 4.7 |
| New releases (90 days) | 6% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its review barrier is higher than in 91% of Kindle eBooks categories: the median best seller has 1,397 reviews, so new books need time to build up.
- Its median reviews are 47% of the parent category Mysteries & Detectives (2,975), one of the easier corners under it.
Top 10 Spies best sellers
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The Secret Zoo: A Fast-Paced Middle Grade Fantastic Tale About Kids Discovering a Zoo's Dark Secret
by Bryan Chick
- List rank#2
- Price$9.99
- Rating4.6
- Reviews6,257
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Diary of an 8-Bit Warrior: Crafting Alliances: An Unofficial Minecraft Adventure (Volume 3)
by Cube Kid
- List rank#4
- Price$7.12
- Rating4.8
- Reviews5,229
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Secret Agent 6th Grader: 3 Book Box Set Collection (a funny chapter book for kids 8-12): From the Creator of Diary of a 6th Grade Ninja
- List rank#8
- Price$12.99
- Rating4.7
- Reviews1,424
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I'd Tell You I Love You, But Then I'd Have to Kill You (Gallagher Girls Book 1)
by Ally Carter
- List rank#9
- Price$8.99
- Rating4.4
- Reviews3,092
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FAQ
Is Spies a good niche for Amazon KDP?
Its KDPTop opportunity score is 18/100, which makes it highly competitive. The median best seller has 1,397 reviews and sells for $8.99.
How many reviews do you need to rank in Spies?
The median best seller has 1,397 reviews, and 10% of them have fewer than 100.
What do Spies best sellers cost?
The median price is $8.99; half of the best sellers are priced between $6.99 and $9.99.
Can new books break into Spies?
6% 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.