Mona returns to Rosewood in a very fragile state, and Hanna is determined to help her; Emily tries to help Sara; Spencer finds help from someone from her past.
Aria may not get a chance to see her work on display. Hanna wants to return her scholarship money. Rosewood High considers banning the girls from prom.
Questions about the new mystery surface as the liars stay in Rosewood; A restless Aria starts to look suspicious; Emily continues to lie about her life in California.
Hanna admits the truth; Aria and Emily look for answers about Ezra; Spencer and Caleb try to track down the new threat; New love interests emerge and old ones resurface.
Convinced that Sara Harvey is behind the new threats, the liars work together to get answers; Caleb and Hanna make a plan to fight back against the new stalker.
The liars investigate a new suspect; Aria tells Ezra the truth about the book; Spencer and Caleb deal with a media leak; Emilly is harassed by the stalker.
The liars start taking the threats more seriously; Caleb deals with taking the blame for the leak; Emily tries to track down who attacked her; Aria and Ezra move on with the book.
Alison is faced with a sudden jeopardy; Hanna and Caleb develop a plan to come face-to-face with their tormentor; Emily and Spencer investigate Mona; Aria and Ezra continue with the book.
The stalker threatens to kill the liars if they don't divulge Charlotte's killer by the election; Alison experiences strange visions and starts to question her sanity.