The second season of Pretty Little Liars, based on the books of the same name by Sara Shepard, premiered on June 14, 2011, and concluded on March 19, 2012, on ABC Family.

Picking up the night Ian Thomas's body disappears, Spencer, Aria, Hanna, and Emily are painted as liars by the news and police.

With the help of Melissa's ex-fiancé Wren, the girls follow them out to an old silo, where Ian's body is discovered, along with a suicide note.

Armed with this revelation, the girls begin investigating other potential suspects, such as Alison's older brother Jason, who has moved back to town, as well as Jenna Marshall.

They later cut ties with Garrett Reynolds after learning of his romantic relationship with Jenna, who Ali had accidentally blinded in a prank gone wrong.

Although they break up briefly, Aria and Ezra begin seeing each other in secret with the help of her childhood friend, Holden Strauss.

They throw a vase into the air, shattering the glass ceiling and allowing them enough time to escape; however, Hanna arrives and hits "A" with her car, knocking them down momentarily.

Eventually, Alison is linked to an old doll hospital in town nearby called Brookhaven, and later a rural motel, The Lost Woods Resort.

Emily is struggling to deal with her impending move to Texas and losing her friends, including Toby, who she re-bonds with as they wait for Spencer to join them in secret.

Dr. Sullivan later contacts the girls' parents and recommends that they take some time apart due to their "unstable" behavior during their last therapy session.

Emily, Aria, Hanna, and Spencer learn that Ian's suicide note wasn't real; it was just made up of "A" text messages.

At Ian's funeral, Aria talks to Jason who tells her he thought he could have possibly killed Alison while he was drunk the night of her death and his suspicions were raised when he woke up the next morning with a note that read, "I know what you did."

While doing landscaping work for the Hastings, Toby finds an old hockey stick buried in the backyard, and Spencer's father becomes visibly nervous but burns it in the fire saying it doesn't mean anything.

Emily has been juggling a lot of secrets and lies lately, and with a surprise visit from her father before a big swim meet, the pressure gets to be too much for her — sending her to the hospital with an ulcer.

While visiting Emily, Spencer and Aria take the opportunity to try and do more digging around about the cause of Alison's death and how the broken field hockey stick may play a part in the last few moments of their friend's life.

Meanwhile, Hanna struggles with the prospect of losing both men in her life when her father's wedding "Save the Date" arrives, and the possibility of Caleb running out of Rosewood before his past can come back to haunt him.

Spencer begins to suspect Jason after finding his broken hockey stick in her yard, and deciding that he was the one who stole the missing page in Alison's autopsy file.

Meanwhile, A put steroids in Emily's pain cream which caused her blood tests to show signs of human growth hormones.

Hanna discovers that the man following Caleb is not a policeman, but instead a private investigator hired by his birth mother to find him.

Mona pushes Hanna to try to play nice with her future step-sister, Kate, at her bridesmaids fitting, which ends up with the two riding horses at an equestrian club.

Emily starts community service at the crisis hotline that afternoon, Aria is on lockdown and Hanna is unhappy with Spencer for dragging Caleb into their "A" investigation.

He was missing because he drove around all night selling his comic books to get the money back, and he took Hanna out onto the lake to ask her to soften the blow of the news for Caleb.

Later on, the number they found in Vivian Darkbloom's jacket returns their call and asks to meet up face-to-face to answer some questions.

Garrett gives Caleb a court order to obtain his computer as says someone is hacking into the school's files and he traced it back to his IP address.

In the computer lab, Caleb tells Hanna that Garrett can't get past his firewall without his help and the files from A are all on flash drives.

Aria, Hanna, and Emily go to the address Jonah gave of a law firm but the girls leave in a hurry when an alarm is set off.

In Hanna's bedroom, Ashley spots the letter Aria picked up from the law firm and mentions Melissa worked there as a summer intern.

The girls meet a boy named Duncan from Alison's past, he explains how he and Ali were good friends during the summer before she returned to Rosewood and went missing.

[32] Janel Parrish, Tammin Sursok, Bianca Lawson, and Tyler Blackburn return in the second season as Mona Vanderwaal, Jenna Marshall, Maya St. Germain, and Caleb Rivers.

Also returning are Yani Gellman, Torrey DeVitto, Lindsey Shaw, Claire Holt, Keegan Allen, Brant Daugherty, Brendan Robinson, and Julian Morris, who will all reprise their roles from the first season.