The girls try to clear Spencer's name; Alison encounters a ghostly presence.
An ode to fans with a Halloween Twist!
Aria, Emily, Hanna and Spencer feel trapped and search desperately for a way out of a bad situation.
Melissa reveals her knowledge of Alison's disappearance to Spencer; Emily seeks Ezra's help.
The Liars try to prevent Alison from sending an innocent man to jail; Hanna seeks a normal life.
Hanna's drinking gets out of control; Emily looks for information linking Alison to Noel.
Hanna is pushed down a dark path after Alison moves in; Aria fails in her duties as maid of honor.
Aria searches for information on a patient; Spencer borrows Ezra's spy equipment.
The girls look out for Alison's safety after she is spooked by a recent Rosewood "accident.''
Alison returns to Rosewood High and attempts to repair the damage she inflicted years earlier.
Alison attempts to regain her position as leader of the gang upon her return to Rosewood High.
Alison struggles with the death of her mother, as the Liars try to navigate through her new lie.
Emily, Spencer and Hanna try to adjust to the new normal; Kenneth searches for Jessica.
Aria watches over Ezra at the hospital, while Alison and the others set a trap for "A."