Books like The Black Spectacles
John Dickson Carr
The Black Spectacles is 240 pages, about 4 hours 24 minutes at 250 words a minute.
10 books to read next
How long each takes
Pulp 3.5 h 
Nero Wolfe:Fer De Lance 5.2 h 
Battle Ground 7.9 h 
Inherent Vice 7.0 h 
Private #1 Suspect 7.6 h 
Beekeeper's Apprentice 6.8 h 
Double Whammy 7.5 h 
A Gambling Man 8.2 h 
I, the Jury 3.6 h 
The Invention of Sound 4.4 h Bar height shows length. Estimated at 250 words a minute.