Aria, Emily, Hanna and Spencer are reunited following a summer spent trying to recover from the traumatic events in Rosewood.
A new message from "A" sets the girls on edge; Emily's efforts to refocus on school are jeopardised when she recalls information from "that night."
The girls believe that "A" will strike at Jenna's birthday party; a heartbroken Hanna makes a shocking discovery.
Rosewood becomes a media spectacle as Garrett's murder trial begins; a person close to Aria, Emily, Hanna and Spencer is revealed to be working with "A."
The drama continues moments after the explosive season one finale, and the spotlight is turned on four guilty-looking liars.