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. Dealing with heartbreak, a boyfriend's virginity pledge and a vengeful sister all take a backseat when one girl makes a shocking homecoming date choice 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?

The girls try to resume a sense of normalcy in their lives, but even the simple tasks of dating and extra-circular activities meet with strife. Emily must deal with a jealous teammate 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 another Liar. 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 Ali’s brother, Jason, for information about the night they believe Alison died, only to have to face part of her unpleasant past with Ali.

Still living at a motel, Emily is taken aback when Mrs. Dilaurentis offers to let her move into Ali's old room and is even more distraught when the other Liars insist she take Mrs. D up on her offer. Hanna explodes when it appears her mother's recent good fortune has taken a turn for the worse. And Ezra continues to reel from Maggie's big news when he's dealt an even more crushing blow regarding his son. Meanwhile, Aria makes an effort to get involved in Jake's interests and finds herself with an opportunity to follow up on a lead. And "A" continues to toy with Toby's emotions regarding his mother's death, and Spencer is along for the ride.

Mona returns to Rosewood in a very fragile state as she must answer to the police for faking her death. Matters only get worse when she is confronted by Lesli’s sister about Lesli’s inadvertent involvement in Mona’s plot. Hanna is determined to help Mona out, not only to reassure her she is safe from Alison but also to try and repair Mona’s friendship with Lesli. Emily tries to help Sara with her troubled home life by encouraging her to explore the possibility of emancipation. Spencer, on the other hand, finds help from someone from her past.

Meanwhile, Alison grows closer to Lorenzo as she looks for support outside of her family.

With all signs pointing to Lesli as the tormentor in the hoodie, the PLLs are on a mission to get concrete proof before bringing their findings to the police. But as the girls ramp up their investigation, "A’s" threats escalate.

Meanwhile, a friend of Emily’s makes her a surprising offer, and Spencer is pressured by her family to make an important decision.

Aria, Emily, Hanna and Spencer find themselves back in familiar territory with the Rosewood P.D. knocking at their doors looking for answers and their actions now affecting the loved ones around them. With her mother's job on the line, Hanna tries to come up with an alibi that could save all four of them with the help of her old high school friend, Lucas.

Meanwhile, Emily comes clean about the last five years, and Aria goes the extra mile to keep Ezra's second book in play with her boss.

After the stalker nearly killed Emily, the Liars begin to take the threats more seriously and attempt to keep their mouths shut to prevent any further harm. Caleb must deal with the collateral damage of taking the blame for the leak about Yvonne; Spencer tries to comfort him and get him to tell the truth. Emily goes on a mission to track down who came after her. Aria and Ezra move forward with the novel.

Meanwhile, Hanna avoids dealing with her personal life.