This book continues to explore a post-apocalyptic world with a severe gender asymmetry. Although some women bear living children, and some girls and women survive, the post-fever world still has about 10 men for each women. This plays out in various ways, women are usually either queens or targets. There are even transwomen and a character who is probably genderfluid. 
 And this all works fine for me until we meet the Mormon group. I won't spoil it but it seems like an unexpected fantasy element in SF.