Paige's past comes back to haunt Emily. Aria gets a surprise from Ezra's past.

As the town becomes a media circus in the run-up to the new trial, the girls are betrayed by someone close to them.

Death stalks someone close to Spencer, while Hanna has evidence to ditch, and Aria finds baby-sitting awkward.

The girls are reunited when they each begin receiving threatening messages from someone named "A," suggesting Alison is actually alive - and watching them.

Paige throws Emily a surprise birthday party with even more surprising guests - Jenna and Shana. But it's the actions of "A" at the party that lead to the biggest shock of all.

Still living at a motel, Emily is taken aback when Ali's mother offers to let her move into Ali's old room and is shocked when the other Liars insist Emily take up the offer.

Hanna's interest in crime novels helps her to come up with a plan to figure out whose body is in Ali's grave. Spencer is working overtime to decipher the stories in Ali's diary.