August Ames is lying on her bed studying for Math, when her stepsister, Janice comes in and wants to have some fun. August being a good girl, tells Janice that she needs to study. August takes a break to write in her diary, revealing she's extremely happy she has Janice as a stepsister but admits their personalities clash and sometimes, it feels like murphy's law. Her stepsister's new friend Carmen is a bad influence on Janice, but August can't do anything except stay true to herself and be a good girl. Carmen Caliente shows up at their house ready to party since Janice Griffith and August's parents are gone for the weekend, but August promised her stepmommy there would be no parties while they are gone. It looks like August will have to put a stop to their party plans before things get out of hand!