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When their best friend mysteriously vanishes, four girls believe their secrets are safe forever. But when they begin to receive threatening messages, the truth may be only one text away.

The circumstances surrounding Alison's disappearance continue to haunt Aria, Emily, Spencer and Hanna as questions arise about the night she went missing. To complicate matters, the return of Jenna Cavanaugh to Rosewood makes the girls face an unpleasant past and an incident that sealed their friendship forever. Can the girls face what has taken place in their past, especially since "A" won't let them forget?

"The past will come back to haunt you" -- this saying has never been more true than for Aria, Spencer, Hanna and Emily. As the girls try to pay tribute to Alison's memory, the four friends are faced with unresolved issues. Aria has an unsettling encounter with Byron's old mistress, Meredith. Emily is forced to see Toby Cavanaugh in a new light. Spencer is reeling in the wake of someone with a vengeance and Hanna is desperate to have her boyfriend forget the "old" Hanna. With "A" taunting them every step of the way, can the girls forge ahead and leave the past behind? Meanwhile, Detective Wilden uses his new connection to Hanna and Ashley to his benefit. But will he get the answers he's looking for by making himself at home in the Marin household?

Tired of being harassed by "A," the girls decide to put a stop to the anonymous emails and text messages by blocking all unknown users. But just because the mysterious ghost isn't looming over their heads, the girls' problems are far from over. With a surprise visit by a father, a surprise gift from a prospective paramour, getting some unwanted advice and an unwanted scholarly accolade -- the girls' lives continue to get more complicated by the day. Do the four girls really think they can keep "A" away forever?

Trying to ignore "A" backfired for the girls and now they must pay the penalty. Whether it is a family in crisis, parental praise for an undeserved honor looming over their head or wearing totally unfashionable scrubs while working off a debt -- the girls must deal with it all. And on top of that the lipstick message from "A" is still haunting them. Meanwhile, the girls must also deal with typical teenage drama -- the boy kind. A new guy arrives and pushes the status quo, a secret love is tested, a new romance blooms and an old romance floats in the gray area.

The Homecoming decorating committee is knee-deep in balloons and girls are jockeying for position to be the queen, while four friends from Rosewood just try to stay afloat. One girl makes a shocking choice for a homecoming that puts her in a possibly sticky situation. Will the girls be able to protect one of their own or will the evening turn out to be a night they can never forget?

In the aftermath of the disastrous homecoming dance, the girls try to sort out the devastation that is left behind. Parents, boyfriends (secret ones, possible ones and current ones), siblings and friends are all in flux, and if the little liars don't act fast, the situation could go from bad to worse. To top it off, the girls are sitting on some killer information about Toby that some people would die to get their hands on. Meanwhile, "A" isn't the only one sending Aria text messages, as tensions rise in the Montgomery household.

After much planning, the day of Alison's memorial is around the corner and the girls are ready to say their good-byes. But when Alison's brother Jason DiLaurentis arrives, Spencer, Aria, Hanna and Emily quickly learn that saying good-bye is at the bottom of his list. As Jason takes over, and Detective Wilden returns, will the girls be able to celebrate Alison's life in the peaceful and positive way they were hoping for? Meanwhile, Hanna is forced to deal with a situation at home that could really cramp her "It girl" status.

A day of SAT testing is put on hold when a violent storm hits Rosewood. But instead of being able to enjoy the postponement of academics, the girls are stuck inside the school dealing with the drama that follows them everywhere. Each girl finds herself in the middle of a tense situation ... and whether it's between friends, potential love interests, a boyfriend and a parent, or between the past and the present, at the end of the day, the girls will think that taking a standardized test would have been a piece of cake compared to what they went through. Meanwhile, Byron leans on Ashley for advice on parenting as his relationship with Ella takes a turn for the worse.

The discovery of a new piece of evidence about Alison's disappearance brings the FBI to town, and the last thing the girls want to do is go "glamping" (glam-style camping) for a birthday party. But when they get a text that insinuates that "A" will be at the party, Spencer gets the idea that it may be their chance to finally put an end to the threats. Once at the camp party, however, not even the mani/pedi station can lift the girls' spirits when the evening takes a dangerous turn. Meanwhile, the Marin financial situation is pushing Ashley to the brink.

No longer just threatening to reveal secrets, the all-knowing "A" has stepped up the game. And while they work hard to protect what they know, the four girls are also on the hunt to learn the truth about what happened to Alison the night she disappeared. But when those truths start to come out, will the girls be prepared for what they must face when new secrets are revealed? Moments after Hanna is hit by a car, the girls' world is turned upside down. "A" is no longer content to play a game of cat and mouse, and things take a far more precarious turn. More than ever, the four girls must turn to each other for support. With Hanna in the hospital and armed with the information of who "A" is, the girls backtrack to figure out how they got to this point. How could this person know everything?

Hanna's return home from the hospital should be a joyous event, but being stuck in a wheelchair and feeling haunted by "A" makes her return feel more like a Hitchcock nightmare than a proper homecoming. Even though the girls try their best to support Hanna, they all have troubles they must face as well: Spencer is still reeling from Melissa's surprise, when an unexpected roadblock is thrown up in her relationship with Alex; Emily is hoping that an introduction to Maya during a tense family meal will smooth whatever apprehensions her parents may have; and blackmail is in the air as Aria and Ezra suspect a student is on to them.

Relationships are in flux in Rosewood as the girls face many obstacles. As Noel steps up his pursuit of Ezra, Aria and Ezra begin to feel like there may be no way out. Emily must also deal with opposition to her love life, as her mother Pam's perceived tolerance of Maya comes to a screeching halt. And Spencer must now handle the return of happy newlyweds Melissa and Ian, even though her suspicions of Ian's ties to Alison grow. Meanwhile, "A" has Hanna jumping through old hoops with regard to the stolen money. Will Hanna fall back into her old ways, or does she have the will power to stand up to "A" and her games? With the support of each other, however, and unexpected help from an unlikely source, the future for the girls doesn't look so hopeless.

As the school gets ready for the dance-a-thon, Aria, Emily, Hanna and Spencer have more on their minds than just raising money for the school trip to Washington, D.C. Hanna is having a hard time finding a job to help her family's financial situation; will she be able to refuse when "A" has a job for her? Emily can only think of Maya and is so desperate to speak to her that she enlists the help of Caleb, the new bad boy at school. Meanwhile, Aria's former babysitter, Simone, comes back to town for a surprise visit, but what should be a happy reunion quickly becomes a nightmare for Aria when Simone sets her sights on Ezra. And, as an important piece of property goes missing, Spencer finds being in close quarters with her new brother-in-law Ian more difficult than ever.

The girls try to resume a sense of normalcy in their lives, but even the simple tasks of dating and extracurricular activities meet with strife. Emily must deal with a jealous teammate, Paige, who is threatened by Emily's return to the pool, as Aria and Ezra plan their first date out in the open. And Hanna is still stuck playing "A's" game, but the next hurdle might just have complications for one of the other girls. With "A" pulling the strings and making matters worse, will the girls be able to weather the storm and lie their way out of it, or will they have to face the ugly truths? Meanwhile, Spencer turns to Alison's brother Jason for information about the night they believe Alison died, only to have to face part of her unpleasant past with Ali.

A crucial swim meet for the Rosewood Sharks is the setting where Aria, Emily, Hanna and Spencer experience a lot of turmoil. Emily and Paige go for round two, as they are pitted against each other to compete for the anchor leg of the big race. Plus, Caleb calls in his favor with a guilty Hanna as she tries to deter Aria from asking too many questions about Ella's ticket to the museum opening. As secrets start to be revealed and antagonists become less threatening, could the game be changing for the girls? Meanwhile, Spencer takes on the task of tutoring a fellow student to try and get some answers.

What happens to one little liar when parent-teacher conferences come around and her father sits face to face with the love of her life? What about when another one reaches out to a tarnished innocent, when nobody else will? And what about the liar who is taken by surprise by an unpleasant person? Lastly, don't forget about the liar who is getting way too comfortable with someone she might not want to trust. Whatever the situation, "A" is certain to have something to say about it. Oh, just another normal day in Rosewood, PA, for Aria, Emily, Hanna and Spencer.

As their doubts, fears and suspicions grow, Aria, Emily, Hanna and Spencer start to wonder what the true face of evil looks like. Is it the girl who holds a grudge and will do anything to keep her loved ones near? Is it the new brother-in-law who might have a darker side beneath the surface? Or is it an unknown stranger who is playing puppet master with the lives of four girls? Only time will tell who the bad seed is. Meanwhile, Aria views the school play as an opportunity to get closer to Ezra. But will her plan backfire and put her relationship in jeopardy?

After a shocking revelation from the police, the spotlight is turned on four little liars who look to be crying wolf. But with everything pointing to Ian, how could the girls be wrong? Or could this be just another game "A" is playing with them? With the cops now demanding answers from Aria, Emily, Hanna and Spencer, will the girls come clean about "A," or are some secrets better left unspoken? Meanwhile, secret relationships take a toll on some of the girls while blossoming for others. Love is not for the faint of heart.

Everyone has a secret in Rosewood and it's only a matter of time before it is revealed. Four girls know this to be especially true and are reminded of it on a daily basis. As the police turn up the heat and make Spencer an official "person of interest," maybe the girls should take a closer look at those around them. The boy one has given her heart to may have ulterior motives; the girl they have wronged may not be as innocent as they think; and the person another likes may make a rash decision that cuts to the bone. All are things that the girls should take into account ... before "A" does. Meanwhile, Ella and Byron try to decide what the latest development in their relationship means for them and their family.

Rosewood's Founders Festival sets the stage for more secrets. Everyone has something to hide -whether it is a secret romance, or revealing a true identity and true intentions. For Aria, Emily, Hanna and Spencer, keeping things hidden is second nature, but having to live with those secrets can become a big burden. How long can Aria be with someone when they can't go out in public? Is it a true friendship when Spencer and Toby aren't able to be seen together? How truthful can Emily be when she can't be honest about whom she wants to be with? And how can Hanna move on when secretly she wants to be with the one who broke her heart? With someone like "A" out there to watch their every move, the four girls may not have to worry about keeping things hidden for too much longer.

In the season one finale, now that Aria, Emily, Hanna and Spencer are in possession of the information that Alison left them, the girls decide that it's time to finally put an end to "A" and the mystery surrounding their friend. But without certain proof that their hunch is right, how can the girls catch "A" in his/her own game? With little more than a video and hazy memories of the night that Alison disappeared, the girls may have to turn to an unlikely source of information to help them put a stop to "A" once and for all -- or so they think.