Aria has an unsettling encounter with Meredith; Emily is forced to see Toby in a new light; Spencer is reeling in the wake of a vengeful Melissa.

The liars are trapped at school as a bad storm brews, and tensions run high; Byron leans on Ashley for advice on parenting as his relationship with Ella takes a bad turn.

As the liars try their best to support Hanna's release from the hospital, they each have their own surprises to deal with.

After a shocking revelation from the police, it looks like the liars could be crying wolf. With everything pointing to Ian, could the girls be wrong?

As the heat is turned up on suspicions surrounding Spencer, the liars must come to the harsh realization that they aren't the only ones hiding secrets in Rosewood.

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.

In the season one finale, the girls go to an unlikely source for help to put an end to "A" and the mystery surrounding their friend. Can they really stop "A" once and for all?

The liars face the fallout from what happened with Ian at the church, their parents have them talk with a therapist; Caleb returns to see Hanna; Spencer is told Toby is off-limits.

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.

Spencer is determined to find out what Jason is hiding at his house; Aria can't seem to get Jason off her mind for a different reason; Hanna helps Caleb with a difficult decision about his family.

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?

Aria continues to question Holden on what exactly he is up to during their "date nights"; Hanna tries to figure out the latest situation with Kate; Emily gets help from an unlikely source to get back on the Rosewood swim team.

The liars are on the quest for answers of what Alison knew before she died; Jason drops off a bag of Alison's personal items that could be more than just a bag of junk; Toby's return to Rosewood brings a surprise reunion that ends dangerously.

As the second anniversary of Alison's disappearance nears, Aria, Emily, Hanna and Spencer are thrown back into turmoil after a shocking night.

One of Aria's past indiscretions is fodder for a new "A." A still-shaky Emily tries to focus on school, but could be derailed when she remembers a crucial piece from "that night."

When Spencer questions her mother taking on Garrett's case, she stumbles upon a larger secret; Aria agrees to be Jenna's accompanist.

Hanna and Mona's visits cause tension with Caleb; Emily finds solace after meeting Maya's cousin; Spencer must know the truth about Melissa.

Emily is caught in the crossfire as Maya's murderer is revealed; The liars are betrayed by someone close to them.

Meredith helps take care of Aria when she is sick - but could she have ulterior motives?; Spencer surprises Toby for their anniversary.

"A" plays games with higher stakes. Aria considers things with Ezra and Hanna is thrown in the midst of Caleb's family drama. Spencer looks for answers about Mona's time in Radley.

A new detective means new questions, and the liars are asked some hard questions; Spencer lays a trap for Melissa.

Spencer and Emily visit a nearby college, but they have different agendas for their time on campus. Hanna is frantic after another horrifying discovery among her mom's things.

Caleb tries to convince Hanna that Mona can't be trusted, causing Mona to prove her loyalty in the most unexpected way; Emily reconnects with her old boss Zoe.

Paige throws Emily a surprise birthday party; Mona's selfless act provides Hanna and her mother with their first bit of good news; Ezra gets some distressing news.

Mrs. DiLaurentis offers to let Emily move into Ali's old room; Trying to get involved in Jake's interests; Aria finds an opportunity to follow a lead.

Spencer is determined that it is finally time to tell Aria about what she has found out about Ezra, but Emily and Hanna are worried about what it could do to her.

Emily, Hanna and Spencer are concerned for Aria as they watch their friend crumble after learning shocking news about Ezra. Not knowing what is true or who to trust, Aria goes looking for answers, not wanting to believe this revelation to be true. Spencer is concerned for Aria, but she is not doing so well herself. Trying to prove to her parents and Toby that she can kick the habit on her own, Spencer has to be careful because one misstep could send her to rehab. Can Spencer really rein it in, or will her constant curiosity and drive be her undoing? Meanwhile, Paige has had enough with Emily's secrets and is determined to stop it.

Emily takes up the sleuthing reins and hunts for answers about Ezra and Mona; Hanna begins a new search after being confronted by Holbrook and Tanner; Spencer and Aria lean on new men in their lives to recover.

It is a rough time for all of the Liars as Spencer is reeling about the memories from her "lost summer," Aria is still nursing a broken heart, Emily is reeling from Paige's betrayal and Hanna unsuccessfully attempts to wade back into the dating pool. But as each girl tries to deal with her individual issues, they must focus their attention on their suspicions surrounding Mrs. DiLaurentis. Assuming that Mrs. D knows more about Ali and the night she went missing, girls decide to help out at her charity bridal fashion show to gain access to the DiLaurentis house to search for answers. Meanwhile, Ella and Jason return to Rosewood, each with something to hide.

The liars finally get answers about the night Ali disappeared. With their newfound knowledge of Ali's long-held secrets, can they figure out who "A" is?

The PLLs must dodge their dreaded nemesis, "A," while navigating a world with Alison back in it.

The liars try to wrap their head around the new normal; Jason's odd behavior and Kenneth's search for Jessica starts to raise eyebrows.

The liars keep their distance from Ali; Spencer finds out Peter has a little more than something to do with Jessica's murder; Aria wants to know more about Shana.

Ali returns to Rosewood High and hopes to help heal the damage she did years ago, but not if Mona and her army have anything to say about it; Caleb and an old foe return to Rosewood.

With 'A' back in their lives, the girls are determined more than ever to know his/her identity. While Ali prepares to run away from Rosewood, Hanna faces a challenge in her relationships. Detective Tanner digs deeper into the death of Shana.

Spencer spends time with Jonny; Emily tries to figure out Talia; Hanna digs into the past of Mona's friend Lesli; Mike's behavior concerns Aria; Holbrook returns to Rosewood.

Equipped with their new information about Mona, the liars decide they need to speak to Alison; Aria quickly learns that Mike's involvement could have serious repercussions for her family; The liars intensify their search for information on "A"; Ali looks to someone surprising for help with her murder trial.

Ali has to choose between saving herself or sacrificing one of the liars.

The PLL's struggle to find evidence against "A" to help an imprisoned Hanna get out of jail. Meanwhile, Alison's trial is expected very soon and not only does it decide her fate, but it also unravels a lot of secrets the group has told.

'A' has always had fun playing with the liars, but now they have the biggest game to date in store for the girls.

The girls struggle with the lasting after effects of their time spent in the dollhouse.

The girls' lives have been turned upside down by their captivity and each one of them is looking for answers to make sense of their ordeal.

As the girls attend their senior prom, A's threats escalate and the girls get one step closer to finding out the truth about Charles DiLaurentis.

After years of torment, the liars will finally come face to face with their tormenter, and uncover the puppeteer behind the hoodie.

After five years, the liars return to Rosewood when Alison asks them her to testify for Charlotte's release.

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.

Spencer learns her mother is keeping a secret; Mona reveals where her true allegiances lie; Emily and Hanna each receive shocking threats.

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 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.

With more secrets being uncovered, the liars all have something to deal with; A.D sets a game for the liars.

Emily butts heads with teenager Addison; Spencer confronts her mother; Aria confides in Holden; Jenna stirs up trouble when she returns.

Ali's turn at the game forces her to face a monumental personal decision; Hanna and Spencer run into a familiar face with a shocking secret.

Emily teams up with Mona; Ashley returns after learning frightening information; Spencer's family reels from A.D's latest taunt.

Secrets come tumbling out as the ultimate endgame comes to light and A.D. is revealed.