Hardy Boys 19: The Disappearing Floor
Penguin 1940
Great fit for 5th grade
Reading level and content both target 4th–8th grade · ages 9–14
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Genre
Themes
- detective work
- bravery
- teamwork
- perseverance
- deception
- justice
- technology and ethics
- family
About this book
Frank and Joe Hardy join their father on a baffling case involving a jewel thief, a guarded mansion, and strange happenings around Bayport. Clues lead them to an eerie estate with a vanishing floor, a terrifying hound, and a mysterious scientific invention. Action, puzzles, and close calls keep the pages turning as the brothers use logic, courage, and teamwork to untangle the truth. Perfect for mystery-loving middle graders who enjoy fast-paced sleuthing without heavy scares.
Setting: Bayport and the old Perth estate, mid-20th-century small-town America
Frequently Asked Questions
Is Hardy Boys 19: The Disappearing Floor right for my child?
Yes — Hardy Boys 19: The Disappearing Floor is a great fit for 5th grade. The reading level is AR 5.6, 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 detective work, bravery, teamwork.
How long does it take to read Hardy Boys 19: The Disappearing Floor?
At a typical 5th grade reading pace, Hardy Boys 19: The Disappearing Floor takes around 4.7h to finish. The book has 46,000 words. Slower or faster readers may vary significantly.
Does Hardy Boys 19: The Disappearing Floor have an AR quiz?
Yes — Hardy Boys 19: The Disappearing Floor 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 19: The Disappearing Floor?
Hardy Boys 19: The Disappearing Floor has an AR reading level of 5.6, 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.