In "Keys to the Demon Prison" by Brandon Mull, the thrilling conclusion to the Fablehaven series unfolds as Kendra and Seth Sorenson confront the looming threat of a powerful demon Lord, known as the Shadow Plague. The siblings embark on a perilous journey to unlock the secrets of a hidden prison that houses dangerous creatures, racing against time to prevent the demon from unleashing chaos. As they gather allies and face formidable challenges, Kendra and Seth must leverage their magical abilities, courage, and teamwork to protect their world from a dark catastrophe and ultimately restore balance between the realms of light and shadow. [Generated by language model - please report any problems].

This book is part of a book series called Fablehaven .

This book is aimed at children at US 3rd grade-8th grade.

This book has been graded for interest at 8-13 years.

There are 640 pages in this book. This book was published in 2011 by Simon & Schuster .

Brandon Mull is the author of the New York Times, USA TODAY, and Wall Street Journal bestselling Beyonders and Fablehaven series. He resides in Utah, in a happy little valley near the mouth of a canyon with his wife and four children. Brandon Dorman is the illustrator of Be Glad Your Nose is on Your Face and The Wizard , both by Jack Prelutsky; and The Christmas Sweater by Glenn Beck. He received a degree in fine arts from Brigham Young University-Idaho and lives in Puyallup, Washington, with his family.