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.

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.

Rule number one of being an effective stalker: get to know your prey, the trouble they get into, the messes they make, and the secrets they keep. Hanna's desperate for a very personal session with her gym trainer. Emily is number one on Santa's naughty list. Aria's old flame from Iceland is about to land her in hot water. And Spencer's resorting to some backhanded tactics to get what she wants.

"As a seventeen-year-old sophomore at NYU, Casey wears different disguises to fit in, but when she starts hearing voices and seeing visions, she travels to a remote beach town and searches for answers."--

When a rich bully and someone else dies, Mackenzie, Ava, Caitlin, Julie, and Parker wonder if they're being framed. Or are they about to become the killer's next targets?

After surviving their latest encounter with A, high school seniors Aria, Emily, Spencer, and Hanna must try to convince the police that the real A is still on the loose, all while trying to stay alive.

The four former best friends try to overcome their friend Ali's murder, but become alarmed when they receive text messages from the mysterious "A" and learn that their friend's accused killer has been released from jail on bail.

When Eliza Fontaine is rescued from the bottom of a hotel pool just a few weeks before her first novel is going to be published, her family assumes that it's another failed suicide attempt. But Eliza swears she was pushed. The problem is she remembers little of that night, a result of the large quantity of alcohol she consumed and a worsening struggle with memory loss due to a brain tumor. Feeling ignored and vulnerable, she decides she must find...

The stalker's identity has finally been revealed, but Spencer, Emily, Hanna and Aria are bound to repeat the past, and continue to be bad.