Books like Captive in the Underworld
Lianyu Tan
Captive in the Underworld is 316 pages, about 5 hours 48 minutes at 250 words a minute.
12 books to read next
How long each takes
The Book Eaters 5.6 h 
Carmilla and Laura 3.1 h Payback's a Witch 6.5 h Those Who Wait 11.7 h 
Breaking Character 6.1 h 
When You Least Expect It 4.5 h 
Gideon the Ninth 8.2 h 
Stone Butch Blues 8.1 h 
Rubyfruit Jungle 4.5 h 
Harrow the Ninth 9.4 h 
The Well of Loneliness 9.1 h 
Tipping the Velvet 8.8 h Bar height shows length. Estimated at 250 words a minute.