The Infinity Clue
by Franklin Dixon
Pocket Books 1989
The Hardy Boys
Great fit for 5th grade
Reading level and content both target 4th–8th grade · ages 9–14
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Genre
Themes
- brotherhood
- teamwork
- justice
- crime and mystery
- courage under pressure
- problem-solving
- deception and double-crosses
- pursuit of truth
About this book
Frank and Joe Hardy are pulled into a high-stakes case when a dazzling diamond theft links to a shadowy terrorist ring. From coded clues to daring chases, the brothers use quick thinking and teamwork to stay one step ahead of dangerous criminals. Fast-paced chapters, gadgets, and twists make this an exciting read for mystery and action fans. Great for middle-grade readers who enjoy classic detective adventures without heavy content.
Setting: contemporary locations in the U.S. and abroad
Frequently Asked Questions
Is The Infinity Clue right for my child?
Yes — The Infinity Clue is a great fit for 5th grade. The reading level is AR 5.4, which is typical for 5th grade. The interest level is rated Middle Grades (4–8), meaning the themes and content are designed for ages 9–14 (4th–8th grade). Themes include brotherhood, teamwork, justice.
How long does it take to read The Infinity Clue?
At a typical 5th grade reading pace, The Infinity Clue takes around 4.8h to finish. The book has 47,000 words. Slower or faster readers may vary significantly.
Does The Infinity Clue have an AR quiz?
Yes — The Infinity Clue has an AR quiz available, worth 6 points. 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 The Infinity Clue?
The Infinity Clue has an AR reading level of 5.4, which places it at a 5th grade reading difficulty. The interest level is rated Middle Grades (4–8) — 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.