Much darker than expected. McElroy had great points on toxic masculinity but it could've been executed better. I'm not sure how, but I was left a bit unsatisfied. Still a great book, though! I'm still not sure about Sasha's character. I didn't understand what she wanted or what she had to lose. We know she wants to get back at Cassandra and Blake but does she really? Did she truly want to be a leader? We see Sasha though other people's perspectives (which is the author's point and done well) but I didn't understand who she really was as a person. No character development on Sasha's end. 
My favorite parts were the flashbacks to Sasha and Dyson's childhood. 
This would make a great TV show