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Aria, Hannah, Spencer and Emily finally learn what really happened to Ali on the night that she disappeared.

Pretty Little Liars

A Is for Answers

The girls help out at a charity bridal fashion show in order to gain access to Mrs. DiLaurentis' home; Jason and Ella return to Rosewood; Aria nurses a broken heart; Spencer confronts memories from her "lost summer."

Unbridled

Emily digs for answers about Mona and Ezra; Hanna learns about a possible new lead in Alison's case; Spencer and Aria hope to find support from new relationships.

Cover for Me

Aria unravels after she learns about Ezra's betrayal; Spencer tries to prove to Toby and her parents that she can overcome her addiction; Paige becomes fed up with Emily's secrets.

She's Come Undone

Spencer prepares to reveal news about Ezra to Aria; the girls don't know what to believe when Spencer's addiction places her credibility into question.

Free Fall

Spencer's sleepless nights and use of prescription medication transforms her reality to that of a black-and-white, film-noir world.

Shadow Play

Prescription medication and sleepless nights affect Spencer's behavior as she attempts to prove her theory before telling the others; Emily hopes to make amends with Alison.

Hot for Teacher

Hanna tries to determine the identity of the body in Ali's grave; Spencer digs for clues about Ali's mystery man; Aria dislikes Mike's new friend; Emily's father worries about her behavior.

Bite Your Tongue

The girls try to decide if new information about Ali is true; Hanna and Aria contend with matters of the heart.

Close Encounters

The girls attempt to decode the stories in Ali's diary; Spencer has suspicions about her father's involvement with Mrs. DiLaurentis.

Love ShAck, Baby

Hanna suggests that the girls find out who is really buried in Alison's grave; Caleb returns to Rosewood; Ezra secretly meets with Mona and Aria.

Who's in the Box?

The ladies crash the Ravenswood Founders Day Celebration after learning that Ali may be alive; Caleb meets a kindred soul as he travels to Ravenswood to help the girls.

Grave New World

Four teenagers band together against an unknown foe who threatens to expose their secrets.

S4 E15 | Love ShAck, Baby

E24 | A Is for Answers

E23 | Unbridled

E22 | Cover for Me

E21 | She's Come Undone

E20 | Free Fall

E19 | Shadow Play

E18 | Hot for Teacher

E17 | Bite Your Tongue

E16 | Close Encounters

E15 | Love ShAck, Baby

E14 | Who's in the Box?

E13 | Grave New World