On Such A Full Sea by Chang-Rae Lee
She travels across a ruined, crappy dystopian land in search of her brother. The writing is decent, but nothing amazing. Then she ends up in the city, where she is some kind of a weird slavegirl to an elderly couple. Luckily, her brother is one of the most celebrated neurosurgeons in the land or something, and… I just can’t remember. This one didn’t make much of an impression on me.