What reading level is The case of the diamonds in the desk?

The case of the diamonds in the desk by Lewis B. Montgomery is at a Level 3-4 reading level. Recommended for Lower Grades readers (Ages 5-8).

What age is The case of the diamonds in the desk appropriate for?

The case of the diamonds in the desk is recommended for Ages 5-8. HootRating: 8C (Clear).

What genre is The case of the diamonds in the desk?

The case of the diamonds in the desk is fiction — Juvenile Fiction. Part of the Milo & Jazz Mysteries series.

Does The case of the diamonds in the desk have any content warnings?

The case of the diamonds in the desk has a HootRating of 8C (Clear). 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 case of the diamonds in the desk?

The case of the diamonds in the desk by Lewis B. Montgomery is 98 pages (approximately 6,779 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

The case of the diamonds in the desk

Lewis B. Montgomery

The case of the diamonds in the desk

Age Rating, Reading Level & Content Guide

by Lewis B. Montgomery

Milo & Jazz Mysteries

Reading Level 3-4 8C Ages 5-8 Balanced Read Page-Turner

The text is written at a 3rd grade reading level, the subject matter is intended for younger children (ages 5–8), and the content is gentle with no concerning themes.

Buy on Amazon Listen on Audible

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

About This Book

Milo and Jazz, two young detectives, jump into action when a sparkling diamond necklace turns up unexpectedly in Milo's school desk. Using clever thinking and STEM skills, they unravel clues to solve the mystery and catch the culprit. Along the way, readers can enjoy fun puzzles and secret challenges that sharpen their own detective skills!

Themes

Mystery FriendshipSchoolsSTEMProblem Solving

Quick Assessment

This is a Level 3-4 book with gentle content intensity. No notable content concerns flagged. Written for readers ages 5-8.

Why we rated The case of the diamonds in the desk 8C

The case of the diamonds in the desk is written at a Level 3-4 reading level across 98 pages (approximately 6,779 words). Strong independent readers around grade 4.2 can typically handle this book on their own; with parent or teacher support, The case of the diamonds in the desk works for readers up to grade 5.2.

Read aloud, The case of the diamonds in the desk takes about 45 minutes, which fits within a single read-aloud session.

We rate The case of the diamonds in the desk as 8C ("Clear") because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.

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

Thematically, The case of the diamonds in the desk explores mystery, friendship, schools, stem, and problem solving — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 5-8 range — the maturity and attention span match the story's pacing.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about mystery, friendship, schools.
✓ Readers who fall hard for one book and want a long series to live in — there are 8 more books in the Milo & Jazz Mysteries series.