With the shocking news about Ian making the rounds through Rosewood, the liars and their families all try to cope with the outcome; Hanna gets a surprising look into Caleb's life after his shady foster mother surfaces.

On the eve of the Rosewood Charity Fashion Show, the liars are surprised with Jessica DiLaurentis' return to town and her request that they participate in the show on Alison's behalf; Spencer quickly learns that Mona has stepped in and taken charge of running the event.

The girls are uneasy as each confronts complicated matters. Ezra and Jason are invited to a dinner party at the Montgomerys and vie for Aria's attention.

When Emily's dad surprises her before a big swim meet, the pressure sends her to the hospital; Spencer and Aria use the opportunity to dig for clues about Alison's death.

Spencer is determined to find out what Jason is hiding at his house; Aria can't seem to get Jason off her mind for a different reason; Hanna helps Caleb with a difficult decision about his family.

Aria tries to process Spencer and Emily's news about Jason while dealing with her feelings for him; Hanna tries to be nice to her future stepsister Kate; 'A' turns up the heat on Emily by trying to push her to breaking point.

The liars finally reveal the torment "A" has put them through to the one person they trust outside their group, Dr. Anne Sullivan, but could she be next on "A's" target list?

All is not what it seems as "A" sends the girls on a hunt to destroy lives. Can the liars go through with their given tasks in order to save one, or will they ignore "A" to save those around them from being hurt?

It's the Halloween before Alison went missing and the friends hope to score an invite to Noel's Halloween party; Jenna challenges Ali for Queen Bee dominance; Aria learns a shocking revelation about Byron.

A month has passed since the liars were arrested and they're at each others' throats and Emily has been iced out completely. But what could have divided them so severely, has "A" finally won the game of divide and conquer?

The liars, realizing that "A" is not acting alone and their helper may be closer than they think, decide to enlist Caleb's hacking skills.

With Lucas missing and questions surrounding what happened out on the lake, Hanna can barely catch her breath; Spencer follows a lead about "A" which guides her to an unexpected place and revelation.