Hardy Boys 29: The Secret of the Lost Tunnel
Penguin 1950
Great fit for 5th grade
Reading level and content both target 4th–8th grade · ages 9–14
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Genre
Themes
- teamwork
- courage
- justice
- perseverance
- history and mystery
- family
- problem-solving
- adventure
About this book
Frank and Joe Hardy head to the Deep South to investigate a Civil War mystery and clear the name of a general accused of stealing bank gold. Their search leads to secret tunnels, hidden clues, and dangers that test their courage and teamwork. Fast-paced action, classic sleuthing, and historical twists make this an exciting read for mystery fans. Great for middle-grade readers who enjoy puzzles, adventure, and the Hardy Boys’ unshakeable determination.
Setting: The Deep South, present day, with Civil War-era ruins and hidden tunnels
Frequently Asked Questions
Is Hardy Boys 29: The Secret of the Lost Tunnel right for my child?
Yes — Hardy Boys 29: The Secret of the Lost Tunnel is a great fit for 5th grade. The reading level is AR 5.5, 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 teamwork, courage, justice.
How long does it take to read Hardy Boys 29: The Secret of the Lost Tunnel?
At a typical 5th grade reading pace, Hardy Boys 29: The Secret of the Lost Tunnel takes around 5.0h to finish. The book has 49,000 words. Slower or faster readers may vary significantly.
Does Hardy Boys 29: The Secret of the Lost Tunnel have an AR quiz?
Yes — Hardy Boys 29: The Secret of the Lost Tunnel has an AR quiz available, worth 7 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 Hardy Boys 29: The Secret of the Lost Tunnel?
Hardy Boys 29: The Secret of the Lost Tunnel has an AR reading level of 5.5, 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.