Rosewood is a perfect little town. So quiet and pristine, you'd never guess it holds so many secrets. Some of the ugliest ones belong to the prettiest girls in town: Aria, Spencer, Hanna and Emily, four friends whose darkest secrets have been unraveling since Alison, the Queen Bee of their group disappeared. As the mystery surrounding Ali's disappearance resurfaces, the girls begin getting messages from a mysterious "A," who they quickly realize is out to get them. Now, after years of tormenting and numerous shocking revelations, the Liars are united and ready to kick some "A" and uncover the truth! No longer just wanting to sit by and wait for "A's" latest cruel attack, Aria, Emily, Hanna and Spencer take matters into their own hands and try to finally put a stop to their tormentor. As relationships are put to the test, new and old secrets are revealed and the stakes are raised higher than ever before as the Liars come closer to the truth. Will all of their sacrifices be worth it in the end?