Books like The Knowhow Book of Spycraft
Falcon Travis, Judy Hindley, Colin King
The Knowhow Book of Spycraft is 40 pages, about 44 minutes at 250 words a minute.
12 books to read next
How long each takes
Spy 1.1 h 
Maximum Security 5.5 h 
Geronimo Stilton, Secret Agent 2.2 h 
Class A 5.6 h 
Divine Madness 7.0 h 
Mad Dogs 7.6 h 
I'd Tell You I Love You, But Then I'd Have to Kill You 5.3 h 
City Spies 7.0 h 
Man Vs. Beast 6.2 h 
The Fall 6.5 h 
Etiquette & Espionage 5.4 h 
Woods Runner 3.0 h Bar height shows length. Estimated at 250 words a minute.