Nonfiction-Grades 4-8 (Millbrook Press) Books in Order
Nonfiction-Grades 4-8 (Millbrook Press) is a 5-book series by Rebecca E. Hirsch for ages 9–12, at a grades 5–7 reading level, with gentle to mild content (HootRated intensity 1–2 out of 5).
- Books
- 5
- By publication date
- Content intensity
- Gentle to mild
- HootRated 1–2 out of 5 · avg 1.2
Nonfiction-Grades 4-8 (Millbrook Press) Reading Order
Series numbers aren't available for most Nonfiction-Grades 4-8 (Millbrook Press) books, so they're listed by publication date (oldest first).
| # | Title | Reading Level | Ages | Content |
|---|---|---|---|---|
| 1 | Secrets of the sky caves 2014 · Sandra K. Athans | Level 6-7 | 9-12 | Mild |
| 2 | Masters of disguise 2016 · Rebecca L. Johnson | Level 6-7 | 9-12 | Gentle |
| 3 | Monarchs Are Missing 2018 | Level 6-7 | 9-12 | Gentle |
| 4 | Little Monsters of the Ocean Metamorphosis under the Waves 2019 · Heather L. Montgomery | Level 5-6 | 9-12 | Gentle |
| 5 | When Plants Attack 2019 | Level 5-6 | 9-12 | Gentle |
Content Intensity Across the Series
ConsistentContent stays at a steady intensity level throughout the series.
Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. Nonfiction-Grades 4-8 (Millbrook Press) (5 books by Rebecca E. Hirsch) lands at a grades 5–7 reading level, with average content intensity 1.2/5. Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.
The reading-order table above lists every book with per-volume reading level, age and intensity ratings so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.
All Nonfiction-Grades 4-8 (Millbrook Press) Books
Secrets of the sky caves
Sandra K. Athans
Secrets of the sky caves
Sandra K. Athans
Masters of disguise
Rebecca L. Johnson
Masters of disguise
Rebecca L. Johnson
Monarchs Are Missing
Rebecca E. Hirsch
Monarchs Are Missing
Rebecca E. Hirsch
Little Monsters of the Ocean
Heather L. Montgomery
Little Monsters of the Ocean
Heather L. Montgomery
When Plants Attack
Rebecca E. Hirsch
When Plants Attack
Rebecca E. Hirsch
Series Like Nonfiction-Grades 4-8 (Millbrook Press): What to Read Next
Similar reading level, content intensity and themes.
- Comparing Animal Traits by Rebecca E. Hirsch 14 books · Grades 4–5 · gentle to mild content
- Finding Dinosaurs; Focus Readers by Rebecca E. Hirsch 3 books · Grades 4–5 · gentle content
- Alternator Books; STEM Smackdown by Susan E. Hamen 3 books · Grades 5–6 · gentle to mild content
- Building on a Dream by Tamra B. Orr 5 books · Grades 5–6 · gentle content
- Fossil Files; PowerKids Press by Heather Moore Niver 4 books · Grades 5–6 · gentle content
- Capstone High-Interest Books; Mummies by Charlotte Wilcox 4 books · Grades 5–6 · gentle content
Questions about the Nonfiction-Grades 4-8 (Millbrook Press) series
- What reading level is the Nonfiction-Grades 4-8 (Millbrook Press) series?
- Nonfiction-Grades 4-8 (Millbrook Press) books are at a grades 5–7 reading level (average grade level 6.1), and HootRated recommends the series for ages 9–12. There are 5 books in the series.
- What order should I read the Nonfiction-Grades 4-8 (Millbrook Press) books?
- Series numbers aren't available for most Nonfiction-Grades 4-8 (Millbrook Press) books, so HootRated lists them by publication date: Secrets of the sky caves (2014); Masters of disguise (2016); Monarchs Are Missing (2018); Little Monsters of the Ocean (2019); When Plants Attack (2019).
- What age is the Nonfiction-Grades 4-8 (Millbrook Press) series appropriate for?
- HootRated recommends Nonfiction-Grades 4-8 (Millbrook Press) for ages 9–12. Content is gentle to mild (HootRated intensity 1–2 out of 5). Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.