What reading level is Bsls #99?

Bsls #99 by Ann M. Martin is at a Level 3-4 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is Bsls #99 appropriate for?

Bsls #99 is recommended for Ages 9-12. HootRating: 8C (Clear). Content flags: Mild Peril.

What genre is Bsls #99?

Bsls #99 is fiction — Juvenile Fiction. Part of the Baby-Sitters Little Sister series.

Does Bsls #99 have any content warnings?

Bsls #99 has a HootRating of 8C (Clear). Content flags include: Mild Peril. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is Bsls #99?

Bsls #99 by Ann M. Martin is 112 pages (approximately 12,431 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

Bsls #99

Ann M. Martin

Bsls #99

Age Rating, Reading Level & Content Guide

Karen's Big City Mystery (Baby-Sitters Little Sister)

by Ann M. Martin

Baby-Sitters Little Sister

Reading Level 3-4 8C Ages 9-12 Balanced Read Page-Turner

The text is written at a 3rd grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.

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About This Book

During a month-long stay in Chicago, Karen becomes determined to uncover the truth behind a puzzling robbery in her apartment building. Along the way, she uses her keen observation skills and curiosity to piece together clues and solve the mystery.

Themes

Mystery Friendship Adventure

Quick Assessment

This is a Level 3-4 book with gentle content intensity. Content themes include mild peril. Written for readers ages 9-12.

Why we rated Bsls #99 8C

Bsls #99 is written at a Level 3-4 reading level across 112 pages (approximately 12,431 words). Strong independent readers around grade 4.6 can typically handle this book on their own; with parent or teacher support, Bsls #99 works for readers up to grade 5.6.

Read aloud, Bsls #99 runs about 1.4 hours — long enough to span several bedtime sessions.

We rate Bsls #99 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.

Specific content flags noted by reviewers: Mild Peril.

Thematically, Bsls #99 explores mystery, friendship, and adventure — 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.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about mystery, friendship, adventure.
✓ Readers who fall hard for one book and want a long series to live in — there are 85 more books in the Baby-Sitters Little Sister series.