Now it's confirmed that Alison is alive, who was buried in Ali's coffin?

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.

After Hanna reveals that she has Ali's diary, the liars hope it can answer some questions, but are they ready to admit which personal story is about them?

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.

Shana says that Ali wants to meet Emily - and not the other girls - but could it all be part of an "A" plan?; Aria and Hanna deal with matters of the heart.

"A" goes after Hanna in an unexpected way; Spencer works overtime to decipher the stories in Ali's diary; Aria is upset with the new friend Mike has made.

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.

Spencer's hunt for the truth takes a dangerous turn. Will Hanna be able to figure out Spencer's secret?; Emily looks to make amends with Alison through Shana.

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's numerous sleepless nights, with the help of prescription pills, take a toll on her as her hunt for Ali and much needed answers continues, teleporting her into the world of 1940s film noir.

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.

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.

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.

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.