Books like Secret Service
Christopher M. Andrew
Secret Service is 619 pages, about 11 hours 21 minutes at 250 words a minute.
12 books to read next
How long each takes
The Honourable Schoolboy 10.6 h 
Spycatcher 7.2 h 
By Way of Deception 7.0 h 
Tinker Tailor Soldier Spy 6.8 h 
The Great Game 10.5 h 
The Human Factor 5.8 h 
Every Spy a Prince 8.6 h 
KGB 15.3 h 
For Your Eyes Only 4.4 h 
Forever and a Day 5.6 h Sin of National Conscience 8.3 h 
Gideon's Spies 7.3 h Bar height shows length. Estimated at 250 words a minute.