Books like The Unexpected Mrs. Pollifax
Dorothy Gilman
The Unexpected Mrs. Pollifax is 216 pages, about 3 hours 58 minutes at 250 words a minute.
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Dragon's Claw 5.6 h 
A Taste for Death 5.3 h 
The Night of Morningstar 5.0 h Bar height shows length. Estimated at 250 words a minute.