Love is a powerful motivator for Aria, Emily, Hanna and Spencer, especially if it means keeping their loved ones safe

Hanna starts to crumble under the weight of her secrets, while Spencer follows a blind lead

Picks up a month later in the town of Rosewood after the four Liars were caught by police.

The Halloween before Alison vanished finds her facing a possible usurper to her queen-bee throne. Meanwhile, Aria uncovers something surprising about her dad; and Spencer struggles with her class-election campaign as she deals with parental disapproval.

A vengeful “A” punishes the girls for talking to Dr. Sullivan, whose life is in danger unless the girls obey “A” by completing a series of tasks that will bring pain to themselves and their loved ones

With Emily pushed to her limits, the girls finally confide in Dr. Sullivan about “A.” Meanwhile, Hanna’s grandmother (Betty Buckley) arrives in Rosewood as Tom’s wedding nears

Spencer resolves to uncover what Jason’s hiding at his house, and Emily tags along with her. Meanwhile, Aria wrestles with the increasing attraction she feels toward Jason; and Caleb’s family problems help Hanna reexamine her relationship with her dad.

Emily doesn’t feel at home after moving. Meanwhile, Aria finds Ezra and Jason competing for her affections; Hanna is displeased with Caleb’s indifference to his shady transactions; and Spencer’s dad reacts unexpectedly after Toby uncovers something.

Alison’s mom comes back to town and asks the girls to take part in a charity fashion show, which Mona helps run when Spencer gets too busy. Meanwhile, Aria works on stirring Jason’s memory; and Emily questions the open dating policy she has with Samara.

Aria, Emily, Hanna and Spencer face an unknown evil.