#23 in Middle grade
Fablehaven: Keys to the Demon Prison
- 560
- Pages
- about 10 h
- Reading time
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Our view
“Fablehaven: Keys to the Demon Prison” closes the five-book series with twists, inventive creatures and an ending that satisfies. Brandon Mull gives characters on every side more nuance here, and the alliances keep shifting. Some readers rank it as the strongest volume of “Fablehaven”, and others find the middle stretch more predictable than the rest. At 560 pages it is a finale for those who have read the four earlier books.
The view of the BookRank editors, written from readers’ ratings and comments. It does not affect the score or the book’s place in a ranking.
About the book
Fablehaven: Keys to the Demon Prison is the fifth and final installment in the Fablehaven series by Brandon Mull.
Reading order · Fablehaven
Full order & progress →- FablehavenStart here
–Not ranked yet - Fablehaven: Rise of the Evening Star
7.87.8 / 10 - Fablehaven: Grip of the Shadow Plague
8.28.2 / 10 - Fablehaven: Secrets of the Dragon Sanctuary
8.18.1 / 10 - Fablehaven: Keys to the Demon PrisonThis book
8.28.2 / 10
Where the score comes from
The sources average 8.4 across 128 ratings — not yet many, so the reader vote carries 47% of the weight and the rest pulls toward the Middle grade average of 8.0. That is how 8.2 comes out.
| Source | Average | Ratings | Weight |
|---|---|---|---|
| Open Library | 8.7 | 6 | 5% |
| Hardcover | 8.4 | 122 | 95% |
Frequently asked
What age is Fablehaven: Keys to the Demon Prison for?
Fablehaven: Keys to the Demon Prison sits on the Middle grade shelf in the sources we use, which by convention means roughly ages 8–12. This is a guide from the book’s category, not a publisher’s age rating. It has 560 pages — longer than 55% of the ranked books in Middle grade.
In this book
Themes this book shares with others — each leads to the best books on it.
If you liked this
Same shelf — Middle grade — with scores between 8.0 and 8.4, closest to this book.
