What reading level is The keep of ages?

The keep of ages by Caragh M. O'Brien is at a Level 4-5 reading level (Lexile 700L). Recommended for Middle Grades readers (Ages 9-12).

What age is The keep of ages appropriate for?

The keep of ages is recommended for Ages 9-12. HootRating: 9ME (Moderate — Emotional).

What genre is The keep of ages?

The keep of ages is fiction — Juvenile Fiction.

Does The keep of ages have any content warnings?

The keep of ages has a HootRating of 9ME (Moderate — Emotional). No specific content flags noted. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is The keep of ages?

The keep of ages by Caragh M. O'Brien is 288 pages.

Reviewed by HootRated editorial · Last updated July 16, 2026

The keep of ages

Caragh M. O'Brien

The keep of ages

Age Rating, Reading Level & Content Guide

Book Three of the Vault of Dreamers Trilogy

by Caragh M. O'Brien

Reading Level 4-5 9ME Ages 9-12 Matched

The text is written at a 4th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content has moderate intensity with some emotionally heavy themes.

Buy on Amazon Listen on Audible Find on Bookshop.org

We may earn a commission from these links. Bookshop.org supports independent bookstores with every purchase.

About This Book

There’s a secret hidden deep inside the ruined Grisly Valley—where a haunted theme park lies abandoned and dangerous. Rosie’s family has been taken by the mysterious Dean Berg, and she’s on a daring chase to find them. But what she discovers about the vault of dreamers will change everything, and that’s only the beginning.

Themes

AdventureDystopianFriendship Coming of Age

Quick Assessment

This middle-grade dystopian adventure follows Rosie as she pursues a kidnapper into a contaminated, eerie amusement park. The story blends suspense with themes of courage and resilience, suitable for readers aged 9-12 who enjoy thrilling fiction without graphic content. Parents should note the intense pursuit and dystopian setting but can expect age-appropriate handling of danger and mystery.

Why we rated The keep of ages 9ME

The keep of ages is written at a Level 4-5 reading level with a Lexile measure of 700L across 288 pages. Strong independent readers around grade 5.5 can typically handle this book on their own; with parent or teacher support, The keep of ages works for readers up to grade 6.5.

We rate The keep of ages as 9ME ("Moderate — Emotional") because the content sits in the "Moderate" range — moderate conflict that may involve loss, scary scenes, or interpersonal stakes. The strongest signals come from emotional weight, physical peril — these are the dimensions parents should evaluate against their reader's tolerance.

No specific content flags were raised by community reviewers, which is consistent with the moderate intensity score.

Thematically, The keep of ages explores adventure, dystopian, friendship, and coming of age — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Patient readers who enjoy slower, character-driven stories.
✓ Kids drawn to stories about adventure, dystopian, friendship.

Maybe not for

! Readers who get easily upset by emotional or moderately dark scenes — the conflict here is real, not just background flavor.
! Reluctant readers who need a fast hook — the pacing here rewards patience.