A to Z Mysteries: The Invisible Island
by Ron Roy
Random House Books for Young Readers 2009
Great fit for 3rd grade
Reading level and content both target K–3rd grade · ages 5–9
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Genre
Themes
- friendship
- teamwork
- honesty
- problem-solving
- community
- perseverance
- justice
About this book
Dink, Josh, and Ruth Rose head out for a summer picnic on a nearby island and stumble upon a mysterious $100 bill. When they return to investigate, they uncover clues that lead to a hidden cave stuffed with money—and a puzzling crime to solve. Short chapters, fast-paced action, and plenty of kid-powered sleuthing make this a fun entry point to mysteries for young readers. Perfect for fans of teamwork and brainy problem-solving without anything too scary.
Setting: a small coastal island near Green Lawn, Connecticut; present day, summer
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Frequently Asked Questions
Is A to Z Mysteries: The Invisible Island right for my child?
Yes — A to Z Mysteries: The Invisible Island is a great fit for 3rd grade. The reading level is AR 3.7, which is typical for 3rd grade. The interest level is rated Lower Grades (K–3), meaning the themes and content are designed for ages 5–9 (K–3rd grade). Themes include friendship, teamwork, honesty.
How long does it take to read A to Z Mysteries: The Invisible Island?
At a typical 3rd grade reading pace, A to Z Mysteries: The Invisible Island takes around 1.3h to finish. The book has 10,800 words. Slower or faster readers may vary significantly.
Does A to Z Mysteries: The Invisible Island have an AR quiz?
Yes — A to Z Mysteries: The Invisible Island has an AR quiz available, worth 1 point. Your child will need to take and pass the quiz through their school's Accelerated Reader program to earn credit. The quiz is typically 5–20 multiple choice questions about plot, characters, and setting.
What grade level is A to Z Mysteries: The Invisible Island?
A to Z Mysteries: The Invisible Island has an AR reading level of 3.7, which places it at a 3rd grade reading difficulty. The interest level is rated Lower Grades (K–3) — this reflects the age-appropriateness of the content and themes, not just the reading difficulty. A strong younger reader may handle the words fine while the themes are aimed at an older audience, or vice versa.