The stalker threatens to kill the liars if they don't divulge Charlotte's killer by the election; Spencer and Toby work together to catch Sara; Alison experiences strange visions and starts to question her sanity.
Moments after Hanna is hit by a car, the girls' world is turned upside down. "A" is no longer content playing a game of cat and mouse; With Hanna in the hospital and armed with the information of who "A" is, the girls are backtracking to figure out how they got to this point.
Hanna's return home from the hospital and is stuck in a wheelchair and feels haunted by "A"; Spencer is still reeling from Melissa's surprise; Emily is hoping that an introduction to Maya during a tense family meal will smooth all apprehensions her parents may have; Aria and Fitz suspect a student is on to them.
As Noel steps up his pursuit of Ezra, him and Aria start to feel like there may be no way out; Pam's perceived tolerance of Maya comes to a screeching halt; Spencer must handle the return of happy newlyweds Melissa and Ian; "A" has Hanna jumping through old habit hoops with regard to the stolen money.
As the school gets ready for the dance-a-thon, the girls have more on their minds; Hanna is having a hard time finding a job to help her family's financial situation, but when "A" has a job for her, will Hanna be able to refuse? Emily can only think of Maya and is desperate to speak to her; Spencer finds being in close quarters with Ian, more difficult than ever; Aria's former babysitter, Simone, comes back to town for a surprise visit, and soon sets her sights on Ezra.
Emily must deal with a jealous teammate who is threatened by Emily's return to the pool; Aria and Ezra plan their first date out in the open; Hanna is still stuck playing "A's" game; Spencer turns to Jason for information about the night they believe Alison died, only to have to face part of her unpleasant past with Ali.
Emily and Paige go for round two, as they are pitted against each other to compete for the anchor leg of the big race; Caleb calls in his favor with a guilty Hanna as she tries to deter Aria from asking too many questions about Ella's ticket to the museum opening; Spencer takes on the task of tutoring a fellow student to try and get some answers.
As the heat is turned up on the suspicions surrounding Spencer, the girls must come to the reality that they aren't the only ones hiding secrets in Rosewood. Spencer remembers something that happened the night of the murder.
Everyone has something to hide, but having to live with those secrets can become a big burden for the liars; Spencer and Toby aren't able to be seen together; Rosewood police officer Garrett keeps his promise to keep a close eye on the girls - much closer than they realize.
Emily struggles with her family's impending move to Texas; Spencer tries to be supportive of Toby's new plans to free himself; Ezra's begs Aria to meet him so they can work things out, but she is not so sure there's anything left to say.
With the shocking news about Ian making the rounds through Rosewood, the liars and their families all try to cope with the outcome; Hanna gets a surprising look into Caleb's life after his shady foster mother surfaces.
On the eve of the Rosewood Charity Fashion Show, the liars are surprised with Jessica DiLaurentis' return to town and her request that they participate in the show on Alison's behalf; Spencer quickly learns that Mona has stepped in and taken charge of running the event.
Aria tries to process Spencer and Emily's news about Jason while dealing with her feelings for him; Hanna tries to be nice to her future stepsister Kate; 'A' turns up the heat on Emily by trying to push her to breaking point.
All is not what it seems as "A" sends the girls on a hunt to destroy lives. Can the liars go through with their given tasks in order to save one, or will they ignore "A" to save those around them from being hurt?
It's the Halloween before Alison went missing and the friends hope to score an invite to Noel's Halloween party; A new girl in town challenges Ali for Queen Bee dominance; Aria learns a shocking revelation about her father.