Books like Cries Unheard
Gitta Sereny
Cries Unheard is 418 pages, about 7 hours 40 minutes at 250 words a minute.
7 books to read next
How long each takes
Babyface Killers 5.6 h 
Devil's Knot 7.9 h 
Fiend 5.8 h 
Works 7.3 h 
A Pickpocket's Tale 8.8 h 
Stephen Hawking 3.5 h 
Fantastic Mr. Dahl 3.2 h Bar height shows length. Estimated at 250 words a minute.