Books like Maigret's Revolver
Georges Simenon
Maigret's Revolver is 188 pages, about 3 hours 27 minutes at 250 words a minute.
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Glory in Death 5.7 h 
All the Devils Are Here 8.2 h 
The Midnight Club 6.3 h 
Immortal in Death 6.2 h 
The Black Echo 8.2 h 
A Fatal Grace 5.9 h Bar height shows length. Estimated at 250 words a minute.