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Aria, Emily, Spencer, and Hanna get closer to finding out who "A" is. The girls attendsRosewood's Junior League Masquerade Gala. By the end of the episode, they discover who "A" really is.
The girls suspect that Melissa might be "A", and they set up an investigation. Meanwhile, Aria finds a boarding school application on her Mom's desk, and Jenna takes the bandages off her eyes.
As Aria discovers what Holden's secret is, Caleb becomes the target of a Rosewood Police Department witch hunt after his laptop is confiscated.
While all the Liars seem to be at odds with each other, Toby fights to win Spencer back and becomes suspicious of the antics of the supposed best friends. Meanwhile, the Montgomerys receive some worrisome news.
Maya's trial gets underway, and Emily can't stand the media attention. "A" then extends a branch to the girls, who are skeptical; and someone close to the girls betrays them.
"Truth-Up Day" comes to Rosewood High as a chance for students to put a stop to bullying and clear the air. But for Aria, Emily, Hanna, and Spencer, the day has a whole different meaning. They all see this day as an opportunity to finally get the answers to some burning persoonal questions. Will the girls be ready to handle the truths they are about to receive, or will they crack under the pressure?moreless
The Liars may have a fifth member, as it's revealed that "A" is torturing someone outside of Ali's BFFs. Meanwhile, Wren becomes a much-needed support for Spencer.
The girls have never been closer to discovering "A"'s identity and ask Caleb to use his hacker abilities to help them. The plan goes awry when Hanna doesn't see eye to eye with the girls' request and instead plans a surprise party for Caleb at the Hastings' lake house.
The Liars don't know what they're in for when they meet Duncan, a boy from Ali's past. Meanwhile Toby strolls back into town, and Jason leaves the girls with a treasure: a box of Ali's old belongings.
Aria is finding it hard to believe Spencer and Emily's revelation about Jason all the while dealing with her feelings for him. Hanna tries to play nice with her future stepsister. Meanwhile, "A" continues to torment Emily trying to push her to a breakdown.
Spencer's mom decides to take Garrett as a client. Spencer is convinced that her mother only agreed to do this by force. After she begins to investigate, her suspicions are not confirmed and she comes across a bigger Hastings family secret.
All four of the Liars are at a crossroads. Aria is battling her doubts about staying with Ezra while he manages his new family members. Emily is trying to prove to Spencer that her suspicions were inaccurate, but potentially at a high cost. Hanna finds herself in the midst of Caleb's family drama when it's revealed that Jamie isn't the most trustworthy. Spencer is attempting to find out the details of Mona's stint at Radley.moreless
In A Kiss Before Lying, Caleb is working with Hanna's three best friends to decode video from the night of Alison's murder. Meanwhile, Hanna's evil step-sister, Kate, is enrolling at the same high school. Caleb discovers that Alison had a second fake ID, and in this one she has dark hair, which opens up a whole new line of questions.moreless
Emily tries to figure out what happened the night she was drugged and also tries to fix things with Paige. Ezra's mom gives insight into Ezra's past to Aria. Spencer and Caleb hack a website for Mona and Hanna also tries to help out.
Hanna thinks she is being framed. Mona is asked for assistance from Aria. An oldacquaintanceof Ali and Jason shows up in town.
Aria is desperate to get Ezra to return her calls, while Hanna begs the girls to stop using Caleb as a researcher for "A". Meanwhile Spencer attempts to fend off Toby's attempts at salvaging their relationship.
Hanna and Emily try to figure out clues about Maya at the Kahns' cabin in the woods. Meanwhile, Spencer investigates Noel; and Aria tries to understand what she's learned about Ezra's background.
A summer has passed and the girls reunite in Rosewood and try to get over whats happened.
Aria, Emily, Hanna and Spencer finally decide it is time to tell someone about "A." Meanwhile, Hanna's infamous grandmother drops into town for Tom's rehearsal dinner.
Caleb is mad that Hanna is spending so much time with Mona; Aria doesn't want to tell Ella about the situation of Byron and Meredith; Spencer wants to know the truth about Melissa; The girls find out the identity of the Black Swan.
On the night of Jenna's birthday party, Garrett gets a pass out of jail to visit his mother. Emily will get a look from the inside while working the party, Aria will be working the crowd and Spencer will be staked out at Radley Sanitarium.Hanna's recent heartbreak leads her to a shocking discovery.moreless
Spencer finds out Paige's violent past with Alison and warns Emily about her, but Emily is weary to take her advice. Meanwhile, Aria tries to help Ezra put his past behind him, but this ends up being more difficult than she anticipated.
Suspecting Byron of killing Alison, Aria must investigate her own father, receiving help from both Ella and Meredith but begins to fall ill. Emily and Paige struggle to overcome past events. Spencer battles it out with Mona in order to become team captain of the academic decathlon. Meanwhile Hanna confronts Lucas and Mona.moreless
The Liars become extremely suspicious of Detective Wilden, and begin hunting for answers. Unfortunately, he's hot on their heels, which may halt their investigation before they get all the answers they need. Meanwhile, at the urging of her best friends, Spencer finds someone to confide in.
The Liars all agree that Spencer has not been acting like herself, so when she goes MIA they don't immediately panic, until her family announces that they don't know where she is either. Hanna, Emily and Aria then attempt to track her down, and hope that it isn't A that has gotten to her. In happier news, Emily gets the opportunity to meet Olympic swimmer Missy Franklin.moreless
The Four Liars told someone about "A" and they must now pay the price. Hannah, Aria and Spencer are sent out to do a hard task in order to keep Dr. Sullivan alive. Aria must get rid of Jackie, Hannah must stop her dad and Isabelle's wedding and Spencer must keep Toby safe and in doing so must break up with him. Emily is the only one without a heartbreaking task and is a little worried.moreless
The girls are stressed out when a new message from A appears; When she starts remembering things from "that night", Emily's drive to succeed at school is put on hold.
The girls want to set a trap but the plans look like they might backfire.
As Aria adjusts to Ezra spending time with Malcolm, Hanna deals with an issue regarding her mom, which may or may not be an accident caused by "A". Meanwhile, Spencer is ready to confide in Emily, but Emily has her doubts about what Spencer has to say.
Hanna receives yet another text message from "A" concerning Caleb. Elsewhere, Aria and Spencer head to the Kahn brothers' party to confront Jenna about her truthfulness.
As Rosewood's annual Father-Daughter Dance arrives tensions are high with the Liars and each of their fathers. Meanwhile, Ashley is snooping around attempting to find out what's wrong with Hanna.
When Lucas goes missing Caleb searches tenaciously while Hanna hesitates because she doesn't want it to lead to Caleb's discovery of "A".
In the Halloween event set before Ali died, It's Halloween and Ali is keeping a big secret from Aria, Emily, Hannah and Spencer who all have secrets of their own.
The season 4 premiere finds the Liars having to deal with Mona, as she's now an "A" target, and may have some answers they need. Aria is managing run-ins with Ezra after their break up, while Toby is dealing with by "A" in new ways. Emily begins to think about her post-high school life.moreless