Books like Spy School Secret Service
Stuart Gibbs
Spy School Secret Service is 352 pages, about 6 hours 27 minutes at 250 words a minute.
12 books to read next
How long each takes
United We Spy 5.4 h 
Framed! 5.5 h 
The Case of the Snack Snatcher 2.3 h 
The Body in the Woods 5.1 h 
Harriet the Spy 5.5 h 
Don't Judge a Girl by Her Cover (Gallagher Girls) 5.1 h 
The Girl Who Was Supposed to Die 3.9 h 
Found 6.2 h 
Nevermoor 9.4 h 
Maximum Security 5.5 h 
NERDS 5.8 h 
Scorpia 6.7 h Bar height shows length. Estimated at 250 words a minute.