Books like Perfect Assassin
James Patterson, Brian Sitts
Perfect Assassin is 384 pages, about 7 hours 2 minutes at 250 words a minute.
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How long each takes
My Lovely Wife 7.0 h 
The Reckoning 9.5 h 
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Orphan X 7.3 h 
Look Closer 9.1 h 
The Match 8.1 h 
Livid 8.8 h 
Bright Young Women 7.0 h 
The Getaway 3.3 h 
Computer Science 9.3 h 
Little Secrets 6.5 h 
The Maze 7.9 h Bar height shows length. Estimated at 250 words a minute.