Books like Cherub Shadow Wave
Robert Muchamore
Cherub Shadow Wave is 350 pages, about 6 hours 25 minutes at 250 words a minute.
12 books to read next
How long each takes
Scorpia 6.7 h 
Snakehead 7.5 h 
Never Say Die 6.6 h 
Crocodile Tears 7.1 h 
Agent 21 5.9 h 
Spy School 5.3 h 
Evil Spy School 5.9 h 
Geronimo Stilton, Secret Agent 2.2 h 
Spy School Secret Service 6.5 h 
Spy Ski School 6.4 h 
Spy School Goes South 6.5 h 
Stormbreaker 4.3 h Bar height shows length. Estimated at 250 words a minute.