Dawn - Octavia Butler

Octavia Butler's Dawn is a brilliant exploration of human nature under oppressive conditions, and of the psychology of surviving assimilation. I don't want to give away too much, but suffice to say that her highly original post-apocalyptic vision is powerful, visceral, and disturbing.

This was also the first book I'd read by Octavia Butler, a talented African American female sci-fi author (her Wikipedia page here).