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  • Keys to the Demon Prison

Keys to the Demon Prison

Fablehaven #5
by Brandon Mull
Keys to the Demon Prison (Fablehaven #5) by Brandon Mull
★ 8.86 (107)
123244566472081595610

Since ancient times, the great demon prison Zzyzx has protected the world from the most dangerous servants of darkness, including Gorgrog, the Demon King. After centuries of plotting, the Sphinx is on the verge of recovering the five artifacts necessary to open the legendary prison.

Facing the potential of a world-ending calamity, all friends of light must unite in a final effort to thwart the Sphinx’s designs and find a safe home for the five artifacts. To this end, Kendra, Seth, and the Knights of the Dawn will venture far beyond the walls of Fablehaven to strange and exotic magical preserves across the globe, where the end of every quest becomes the beginning of another.

In this explosive series finale, allegiances will be confirmed and secrets revealed as the forces of light and darkness collide in a desperate struggle to control the keys to the demon prison.

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FantasyYoung AdultDragonsFairies
Release date: 2010

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Brandon Mull

Brandon Mull

Brandon Mull has a rare talent for turning childhood daydreams into epic adventures that captivate millions of readers around the world. His fantasy novels, from the beloved Fablehaven series to the sweeping sagas of Beyonders, Five Kingdoms, and Dragonwatch, invite readers into hidden realms where magic lives alongside danger, and the choices of ordinary kids can change the fate of entire worlds.

Born in California in 1974 and raised with an imagination that never seemed to rest, Mull spent much of his childhood inventing elaborate games and imagining creatures that lurked just out of sight. That creative spark carried into his studies at Brigham Young University, where he not only honed his storytelling voice but also embraced performance as part of a sketch comedy troupe. After graduation he worked a string of day jobs—from movie promoter to filing clerk—while quietly chasing the stories that filled his mind.

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His breakthrough came in 2006 with Fablehaven, a series that quickly grew into an international phenomenon, translated into dozens of languages and selling millions of copies. Known for balancing humor with heart, Mull creates characters who feel both fantastical and real, grounding their struggles in themes of courage, friendship, and moral choice. His school visits and public talks have inspired young readers to see books not as homework but as portals to adventure.

Mull continues to expand his imaginative reach. With the upcoming Guardians trilogy, beginning with Forbidden Mountain in 2026, he is venturing into a wholly original world built on spiritual bonds and epic conflicts, a story he has envisioned for over a decade. The project marks his most ambitious work yet, promising an even grander scope while staying true to the wonder and danger that define his storytelling.

Now living in Utah with his family, Mull writes with the same sense of wonder that guided his boyhood adventures. His books have become treasured gateways for new generations of fantasy readers, offering not just escape, but a reminder of the courage and creativity hidden in us all.

Fablehaven

Fablehaven consists of five books. The current recommended reading order for the series is provided below.

Related series Fablehaven Adventures: Dragonwatch

Fablehaven (Fablehaven #1)
★ 8.02 (193)
Rise of the Evening Star (Fablehaven #2)
★ 8.20 (126)
Grip of the Shadow Plague (Fablehaven #3)
★ 8.56 (116)
Secrets of the Dragon Sanctuary (Fablehaven #4)
★ 8.74 (108)
Keys to the Demon Prison (Fablehaven #5)
★ 8.86 (107)

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