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 are forced to live through Ali's latest lie; Hanna and Aria have loose ends with two people who know about Ali's story; Spencer and Emily try to uncover Jason's whereabouts in New York.

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.

Aria begins her volunteer work at Radley; Spencer borrows Ezra's spy equipment to keep a closer eye on the home front; Ali and Caleb butt heads.

As Hanna's downward spiral continues, an unfortunate incident with Zack threatens to strain her friendship with Aria. Spencer and Emily dig deeper into Bethany's relationship with Mrs. Dilaurentis.

Spencer confronts Caleb regarding Hanna's issues; Aria opens up to Ella and questions her marriage to Zack; Emily and Spencer close in on Noel's motives and a call from detective Tanner has Alison perplexed.

All eyes are on Alison as she struggles with her response to Cyrus' confession. Melissa hints at knowing the truth and warns Spencer to keep away from Ali. Aria mulls over Spencer's plan of letting everything out in the open with Tanner.

The girls join forces with Mona to figure out why Ali reached out to the police. Alison's actions put Spencer in the cross-hairs of Bethany's murder investigation. Mona reveals the truth about Ali, resulting in an aching loss.

It is Christmas time and all of the liars are planning on having a great time at the Ice ball, but 'A' has other plans.

The liars get trapped in an abandoned house with A on their trails they struggle to get out. Meanwhile Toby, Spencer, and Caleb try to find out who killed Mona.

Now that Alison is in jail, the 4 liars are A's victims. The liars are now scared more than ever.

The liars are breaking the law. They need to look in the barrel and find out what's inside. But the cops are on their tail and they're getting ready to arrest. What will be in the tank?

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.

Aria hopes Andrew can be her tutor; Spencer helps Jonny with a new project; Hanna turns to her father for financial assistance; Mike is involved in an incident at the school blood drive.

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.

Alison's trial comes to a close when the prosecution calls a surprise witness; The liars race to find someone or something that can prove Ali's innocence; Mike becomes a target of "A" when it looks like he might be called to testify.

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