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
After Caleb comes back to Rosewood, he determines whether staying is the right thing to do. Alison is feeling awfully scared and considers leaving Rosewood for her safety, but the girls need her there in order to protect her. Ezra commits to finding answers through research of the past and present.moreless
After years of searching for answers and being tortured by A in every way, the girls finally get the key to all the secrets around Ali's disappearance 4 years ago. But the mystery of A's true identity still haunts them. Will Spencer, Emily, Aria and Hanna be clever enough to finish the puzzle and expose who A really is? Will Ali finally get to come back home safe and sound for good?moreless
All four of the Liars are dealing with romantic issues when a charity bridal fashion show hosted by Mrs. DeLaurentis presents itself as an opportunity to gain proximity to her, her house, and Ali's secrets. The girls take advantage of the opportunity as Ella and Jason arrive back in Rosewood.moreless
While Spencer and Aria are on the mend, Emily and Hanna put on their detective caps. Emily tries to uncover what's behind Ezra and Mona's relationship, while Hanna gets herself involved with new clues in Ali's case revealed to her by Detective Holbrook.moreless
All the Liars rally around Aria, who is falling apart after finding out Ezra's true motives. Meanwhile, Spencer attempts to convince her parents and Toby that she can overcome her bad habits independently.moreless
Spencer hits rock bottom and Aria spirals out of control when the ultimate betrayal shatters both of them. Has the past finally caught up with them? Has Ali's attempted murderer been exposed? Is Mrs. DiLaurentis harboring a dirty little secret that could completely unravel Aria, Spencer, Emily and Hannah's lives?moreless
Spencer’s countless sleepless nights due to her abuse of prescription pills are starting to catch up with her. She time travels her way back into the black and white 1940’s Film Noir with her friends, where her mystery solving skills are put to the test! But in this altered reality of trench coats, 15 cent coffee, and pin curls, can Spencer put all of the pieces together to finally find out the truth about Ali?moreless
Since the new discovery, Spencer starts struggling with sleep and turns to a couple classmates with her problem. Hanna is worried about Spencer because her behavior is getting out of control. After the bad confrontation with Alison, Emily tries to mend fences and asks for another chance. Ezra is still on his mission and Aria's many fibs begin to weigh on her and she has no clue what to do.moreless
Aria notices her brother befriending Mona and tries to stop it from continuing. Feeling distracted, Spencer digs into a new lead from Ali's diary and discovers something shocking. Emily's dad grows worried about her; and surprisingly, Hanna's love of crime novels leads her to investigate Alison's grave.moreless
Shana makes a surprise visit to Rosewood, but the gang questions her motives.
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
The girls try to figure out who is buried in Alison's grave. Caleb makes a surprise visit to Rosewood but a sad exit after talking with Hanna. Meanwhile, Emily struggles to come to terms with the revelation that Alison is alive, and Aria meets with Ezra in private.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.