Books like The Reader Is Warned
John Dickson Carr
The Reader Is Warned is 250 pages, about 4 hours 35 minutes at 250 words a minute.
12 books to read next
How long each takes
The Hound of the Baskervilles 3.8 h 
After the Funeral 4.5 h 
The Mirror Crack'd from Side to Side 4.5 h 
They Do It with Mirrors 3.8 h 
Nemesis 4.4 h 
Murder Is Easy 4.1 h 
The Clocks 4.7 h 
Mrs. McGinty's Dead 4.3 h 
Sad Cypress 4.4 h 
Cat Among the Pigeons 4.7 h 
Towards Zero 4.1 h 
The Nine Tailors 6.2 h Bar height shows length. Estimated at 250 words a minute.