Books like Darkness at Pemberley
T. H. White
Darkness at Pemberley is 286 pages, about 5 hours 15 minutes at 250 words a minute.
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How long each takes
The Moonstone 8.2 h 
The Woman in White 10.0 h 
Curtain 4.4 h 
A Blunt Instrument 5.3 h 
The Circular Staircase 4.7 h 
Footsteps in the Dark 5.7 h 
Size 12 Is Not Fat 6.8 h 
Country House Murders 6.8 h 
The Snow Garden 7.5 h 
Justice Hall 6.5 h Bar height shows length. Estimated at 250 words a minute.