Spencer borrows some of Ezra's spy tools, and Emily's mom invites Ali to dinner. Meanwhile, Aria does a little volunteer work at a mental hospital and crosses paths with an aggressive patient. Ali clashes with Caleb, which makes things awkward for Hanna.moreless
Hanna shows the Ali's diary to the other girls. Deciphering it soon proves difficult because it is full of deep and secretive stories about each of them. Meanwhile, Spencer becomes suspicious of her father's work with Mrs. DiLaurentis.moreless
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.
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.moreless
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.
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.
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.moreless
Hanna thinks she is being framed. Mona is asked for assistance from Aria. An oldacquaintanceof Ali and Jason shows up in town.
The girls want to set a trap but the plans look like they might backfire.
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
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.moreless
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.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.
A summer has passed and the girls reunite in Rosewood and try to get over whats happened.
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.moreless
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.moreless
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.
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.
As Aria discovers what Holden's secret is, Caleb becomes the target of a Rosewood Police Department witch hunt after his laptop is confiscated.
"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
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
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.moreless
When Lucas goes missing Caleb searches tenaciously while Hanna hesitates because she doesn't want it to lead to Caleb's discovery of "A".
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.moreless
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.moreless
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.
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.