What reading level is the Spy School series?

The Spy School series by Stuart Gibbs is at a Grade 5.5 reading level (average Grade 5.5). Intended for Middle Grades (Ages 9–12). There are 10 books in the series.

What order should I read the Spy School books?

The Spy School series has 10 books in order: 1. Spy school, 2. Spy Camp, 3. Evil Spy School, 4. Spy ski school, 5. Spy School Secret Service, and 5 more.

What age is the Spy School series appropriate for?

The Spy School series is recommended for Middle Grades (Ages 9–12). The average content intensity is 2/5.

Spy School Books in Order

10 books by Stuart Gibbs. Reading level: Grade 5.5. Middle Grades (Ages 9–12).

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. Spy School (10 books by Stuart Gibbs) lands at reading level Grade 5.5, with average content intensity 2/5. Intensity stays consistent across the series — a kid who can handle the first book can generally handle the rest.

The reading-order table below lists every book with per-volume reading level and intensity badges 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.

Books

Grade 5.5

Reading Level

2/5

Avg. Intensity

Middle Grades

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

#10

#11

First book Latest book

Spy School Reading Order

#	Title	Reading Level	Content
Book 1	Spy school Stuart Gibbs	Level 5-6	Mild
Book 2	Spy Camp Stuart Gibbs	Level 5-6	Mild
Book 3	Evil Spy School Stuart Gibbs	Level 5-6	Mild
Book 4	Spy ski school Stuart Gibbs	Level 5-6	Mild
Book 5	Spy School Secret Service Stuart Gibbs	Level 5-6	Mild
Book 7	Spy School British Invasion Stuart Gibbs	Level 5-6	Mild
Book 8	Spy School Revolution Stuart Gibbs	Level 5-6	Mild
Book 9	Spy School at Sea Stuart Gibbs	Level 5-6	Mild
Book 10	Spy School Project X Stuart Gibbs	Level 5-6	Mild
Book 11	Spy school goes south Stuart Gibbs	Level 5-6	Mild

Level 5-6 Mild

Questions about the Spy School series

What reading level is the Spy School series?: The Spy School series by Stuart Gibbs is at a Grade 5.5 reading level (average Grade 5.5). Intended for Middle Grades (Ages 9–12). There are 10 books in the series.
What order should I read the Spy School books?: The reading-order table above lists all 10 books with per-volume reading level and intensity ratings. Start with book 1 and read in publication order unless the table indicates a different recommended order for newer readers.
What age is the Spy School series appropriate for?: The Spy School series is recommended for Middle Grades (Ages 9–12). The average content intensity is 2/5. Check the intensity trajectory above to see whether content gets heavier across the series — if it does, sensitive readers may want to stop earlier in the run.