Books like The Pool of Fire
John Christopher
The Pool of Fire is 177 pages, about 3 hours 15 minutes at 250 words a minute.
12 books to read next
How long each takes
Demons and Druids 4.8 h 
Space Case 6.5 h 
The Visitor 3.5 h 
The Dangerous Days of Daniel X 5.0 h 
Little Fuzzy 2.8 h 
The Giver 3.7 h 
Watch the Skies 5.3 h 
Zita the Spacegirl 3.3 h 
Prisoner of the Ant People 2.1 h 
The Search for WondLa 9.1 h 
The Forgotten 3.0 h 
Spaced Out 6.2 h Bar height shows length. Estimated at 250 words a minute.