S1, E7: In the aftermath of the disastrous homecoming dance, the girls try to sort out the devastation that is left behind. Parents, boyfriends (secret ones, possible ones and current ones), siblings and friends are all in flux, and if the little liars don't act fast, the situation could go from bad to worse. To top it off, the girls are sitting on some killer information about Toby (recurring guest star Keegan Allen) that some people would die to get their hands on. Meanwhile, "A" isn't the only one sending Aria text messages, as tensions rise in the Montgomery household. Best-selling author Sara Shepard (Pretty Little Liars) makes a cameo appearance as a substitute teacher at Rosewood High School.