A Riddle of Eels
by Nicholas Day
Random House 2026
Great fit for 6th grade
Reading level and content both target 4th–8th grade · ages 9–14
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Genre
Themes
- scientific inquiry
- mysteries of nature
- curiosity
- adaptation
- migration
- ecosystems
- perseverance
- conservation
About this book
Why are eels so mysterious? In this lively, fact-packed nonfiction adventure, Nicholas Day follows scientists and explorers trying to untangle where eels come from, how they live, and why so much about them still stumps experts. With humor, engaging storytelling, and dynamic illustrations, readers travel from rivers to the open ocean to glimpse one of nature’s greatest unsolved puzzles. Perfect for curious middle-grade readers who love real-life mysteries, animals, and science that invites big questions.
Setting: global natural history—rivers, coasts, research labs, and the open Atlantic (including the Sargasso Sea)
Frequently Asked Questions
Is A Riddle of Eels right for my child?
Yes — A Riddle of Eels is a great fit for 6th grade. The reading level is AR 6.3, which is typical for 6th 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 scientific inquiry, mysteries of nature, curiosity.
How long does it take to read A Riddle of Eels?
At a typical 6th grade reading pace, A Riddle of Eels takes around 2.3h to finish. The book has 24,000 words. Slower or faster readers may vary significantly.
Does A Riddle of Eels have an AR quiz?
Yes — A Riddle of Eels has an AR quiz available, worth 3 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 A Riddle of Eels?
A Riddle of Eels has an AR reading level of 6.3, which places it at a 6th 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.