KDP categories · Top KDP authors
RJ Parker: Amazon KDP author data
As of Nov 6, 2026, RJ Parker has 15 books on Amazon, 12 of them on a best-seller list in the last 30 days (best rank #4), mostly in Forensic Psychology, Forensic Medicine, Canada.
| Median price | $5.49 |
|---|---|
| Price range (middle 50%) | $3.24 – $9.72 |
| Median reviews | 427 |
| Total reviews | 9,082 |
| New books (30 days) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- 80% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $5.49, 31% below the median of their main category, Forensic Psychology.
RJ Parker's best-ranked books
-
Hell's Angels Biker Wars: True Story of The Rock Machine and Bandido Massacres (True Crime Murder & Mayhem) (Crimes Canada: True Crimes That Shocked The Nation Book 8)
by RJ Parker
- Price$0.99
- Rating3.7
- Reviews427
-
The Staircase: The Murder of Kathleen Peterson (True Crime Murder & Mayhem)
by RJ Parker
- Price$3.99
- Rating3.4
- Reviews226
-
The Basement: True Story of Serial Killer Gary Heidnik (True Crime Murder & Mayhem)
by RJ Parker
- Price$3.99
- Rating3.4
- Reviews1,150
-
Parents Who Killed Their Children (Horrific True Stories of Filicide): Mental Health, Postpartum Psychosis, and Postpartum Depression
by RJ Parker
- Price$2.99
- Rating3.8
- Reviews1,105
-
TOP CASES of The FBI - Volume 2 (Notorious FBI Cases)
by RJ Parker
- Price$0.99
- Rating3.5
- Reviews214
-
Revenge Killings: The Horrific True Story of LAPD Cop and Serial Killer, Chris Dorner
by RJ Parker
- Price$4.99
- Rating3.5
- Reviews264
-
The BASEMENT: True Crime Serial Killer Gary Heidnik
by RJ Parker
- Price$8.99
- Rating3.4
- Reviews1,149
-
Forensic Analysis and DNA in Criminal Investigations: Including Cold Cases Solved
by RJ Parker
- Price$24.95
- Rating3.9
- Reviews306
-
Forensic Analysis and DNA in Criminal Investigations and Cold Cases Solved
by RJ Parker
- Price$5.99
- Rating3.9
- Reviews306
-
The Basement: True Story of Serial Killer Gary Heidnik
by RJ Parker
- Price$8.01
- Rating3.4
- Reviews1,149
Main categories
FAQ
How many books does RJ Parker have on Amazon?
KDPTop tracks 15 of their books; 12 made an Amazon list in the last 30 days.
Which categories does RJ Parker publish in?
Their books chart most often in Forensic Psychology, Forensic Medicine, Canada.
How does RJ Parker price their books?
The median price is $5.49; half of the books cost $3.24–$9.72.
Has RJ Parker released new books recently?
0 new books in the last 30 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.