Books like Exhibition of Evil
Carolyn Keene
Exhibition of Evil is 224 pages, about 4 hours 6 minutes at 250 words a minute.
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How long each takes
A Matter of Choice 4.7 h 
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The Phantom of Nantucket 3.5 h 
The Ocean of Osyria 1.8 h 
The Deadliest Stunt 2.1 h 
Global Warning 2.1 h Bar height shows length. Estimated at 250 words a minute.