在Alison Dilaurentis神秘失踪一年后，她的朋友们相信他们的秘密永远是安全的，但真相可能只有一个短信的距离。

随着艾莉森失踪当晚出现的种种问题，围绕艾莉森失踪的情况继续困扰着阿瑞雅、艾米丽、斯宾塞和汉娜。

在努力缅怀艾莉森的同时，四个朋友也面临着一些悬而未决的问题。在 “A ”步步紧逼的情况下，女孩们能否勇往直前，摆脱过去？

由于厌倦了 “A ”的骚扰，女孩们决定屏蔽所有未知用户，以阻止匿名电子邮件和短信的发送。但朋友们的问题远没有结束。

试图忽视 “A ”的想法适得其反，现在她们必须为此付出代价。她们还必须面对典型的青春期闹剧--男孩子的那种。

返校节装饰委员会的气球都快淹没膝盖了，女孩们争先恐后地要当女王，而来自紫檀镇的四个朋友却在努力维持生计。

在灾难性的返校舞会之后，女孩们试图理清留下的破坏。如果小骗子们不尽快采取行动，情况可能会变得更糟。

经过精心策划，艾莉森的追悼会即将到来，女孩们已经准备好告别。但她们最后的准备工作很快就出了差错。

一场狂风暴雨袭击了紫檀镇，一天的 SAT 考试被迫暂停，但女孩们却被困在学校里，处理着随处可见的戏剧性事件。

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' for a birthday party.

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.

Hanna's return home from the hospital should be a joyous event, but being stuck in a wheelchair and feeling haunted by 'A' makes it feel more like a Hitchcock nightmare than a proper homecoming.

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.

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 DC.

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.

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?

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 will do anything to keep her loved ones near?

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?

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.

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.

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 the mystery surrounding their friend.