Books like Mountain Top Mystery
Gertrude Chandler Warner, Liz Brizzi, David Cunningham
Mountain Top Mystery is 128 pages, about 2 hours 21 minutes at 250 words a minute.
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Divergent 8.9 h 
The Graveyard Book 5.6 h 
Poached 6.5 h 
Paint The Wind 6.0 h Bar height shows length. Estimated at 250 words a minute.