When one of their tightly-knit group mysteriously disappears, four high school girls find their friendship difficult to maintain when they begin receiving taunting messages from someone who seems to know everything about their past and present secrets.

Seventeen-year-old Emma Paxton steps into the life of her long-lost twin Sutton to solve her murder, while Sutton looks on from her afterlife.

When one of their tightly-knitted group mysteriously disappears, four high school girls find their friendship difficult to maintain when they begin receiving taunting messages from someone who knows their secrets.

Struggling to return to normalcy after surviving Alison's attempt to kill them, Spencer, Aria, Emily and Hanna endure a series of disasters before realizing that they are being stalked by a new "A" who knows all of their secrets.

The only thing more flawless than a Saybrook's diamond solitaire is the family behind the jewelry empire. Beauties, entrepreneurs, debutantes, and style mavens, the Saybrooks are the epitome of New York City's high society. But being a Saybrook comes at a price--they are heirs not only to a dizzying fortune but also to a decades-old family curse. Tragedy strikes the prominent family yet again when thirty-four-year-old Poppy, the most exquisite Saybrook...

After their missing friend's body is found and another of their friends commits suicide, four former best friends live in fear of their secrets being exposed by someone who is stalking them via their cell phones.

"Emily's been shipped off to Iowa to live with her berconservative cousins. Aria's boyfriend is behind bars--because of her. Spencer's afraid she was involved in Ali's murder. But Hanna's fate is far worse: she's clinging to life in the hospital because she knew too much. If these girls don't start listening to me, Hanna's going to look like the lucky one"--P. [4] of cover.

Hanna, Spencer, Emily and Aria are trying to move on and forget about their old friend Alison DiLaurentis and all the torture she put them through, but someone is trying to keep her spirit alive.

When Ali befriends four middle school classmates, she helps them achieve popularity at the price of doing whatever terrible thing Ali wants. Now, three years later, the four girls think they can put the awful experience to rest unless Ali has more in store for them.

Even though the disappearance of Alison DiLaurentis has been solved, Spencer, Emily, Hanna, and Aria harbor other secrets which could interfere with their perfect lives, as they try to forget what happened to them in Jamaica last spring.