Teenage delinquent and her younger sister.

This book revolves around Autumn Casterly, a teenage drug dealer with a bad reputation, and her younger sister Ivy, a shy band geek who likes playing board games with her friends. Towards the end of the First Impression, Autumn has just agreed to do a robbery, which won't go well. Right now the sisters seem a little one-dimensional: Autumn is the bad girl and Ivy is the good girl, but hopefully their characters will develop more as the book goes on.