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William Massa: Amazon KDP author data
As of Nov 6, 2026, William Massa has 72 books on Amazon, 13 of them on a best-seller list in the last 30 days (best rank #6), mostly in Ghosts, Cults & Demonism, Horror.
| Median price | $2.99 |
|---|---|
| Price range (middle 50%) | $2.99 – $5.49 |
| Median reviews | 242 |
| Total reviews | 19,493 |
| New books (30 days) | 5 |
| Breakout books (30 days) | 2 |
What stands out
- Median price $2.99, 40% below the median of their main category, Ghosts.
- 5 new books in the last 30 days, 2 of them broke into a Best Sellers list.
William Massa's best-ranked books
-
The Faceless (The Paranormalist Book 6)
by William Massa
- Price$2.99
- Rating4.6
- Reviews45
-
Servants of the Endless Night (The Paranormalist Book 1)
by William Massa
- Price$0.99
- Rating4.3
- Reviews688
-
Grotesque: A Supernatural Horror Thriller
by William Massa
- Price$2.99
- Rating4.3
- Reviews337
-
The Unearthly (The Paranormalist Book 4)
by William Massa
- Price$2.99
- Rating4.5
- Reviews257
-
Occult Assassin: Dark Missions (Books 1-3) (Supernatural Action Boxset Book 1)
by William Massa
- Price$3.99
- Rating4.3
- Reviews371
-
Damnation Code (Occult Assassin Book 1)
by William Massa
- Price$0.99
- Rating4.0
- Reviews2,103
-
The Exorcist Code
by William Massa
- Price$2.99
- Rating4.2
- Reviews793
-
Doomsday Disciples (Occult Assassin Book 6)
by William Massa
- Price$2.99
- Rating4.4
- Reviews96
-
The Undying (The Paranormalist Book 7)
by William Massa
- Price$2.99
- Rating4.6
- Reviews7
-
Game of the Wolf (The Hexecutioner Book 1)
by William Massa
- Price$0.99
- Rating4.2
- Reviews737
Main categories
FAQ
How many books does William Massa have on Amazon?
KDPTop tracks 72 of their books; 13 made an Amazon list in the last 30 days.
Which categories does William Massa publish in?
Their books chart most often in Ghosts, Cults & Demonism, Horror.
How does William Massa price their books?
The median price is $2.99; half of the books cost $2.99–$5.49.
Has William Massa released new books recently?
5 new books in the last 30 days, 2 of which reached a Best Sellers list.
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.