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.

#1 New York Times bestselling series The eighth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. Hanna, Aria, Spencer, and Emily have been through a lot together-childhood pranks gone horribly wrong, not one, but two stalkers-blackmailers who know all their dirty secrets, not to mention their best friend's murder investigation. Now these pretty little liars are finally going to uncover...

#1 New York Times bestselling series The fifth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. In idyllic Rosewood, Pennsylvania, four very pretty girls just can't help but be bad. Hanna will do anything to be Rosewood's queen bee. Spencer's digging up her family's secrets. Emily can't stop thinking about her new boyfriend. And Aria approves a little too strongly of her mom's taste in...

#1 New York Times bestselling series The second book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. In ultra-exclusive Rosewood, Pennsylvania, four beautiful girls are hiding very ugly secrets. Spencer covets her sister's boyfriend. Aria is fantasizing about her gorgeous young English teacher. Emily is infatuated with the new girl at school. And Hanna is using some ugly tricks to stay amazingly...

#1Burned is the twelfth book in New York Times bestselling author Sara Shepard’s compelling Pretty Little Liars series.

#1Deadly is the fourteenth book in New York Times bestselling author Sara Shepard’s compelling Pretty Little Liars series.

Former best friends Emily, Aria, Hanna, and Spencer continue to live in fear as they struggle to keep hidden even more secrets and someone new begins stalking them via their cell phones.

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.

On trial for murdering an actually still-alive Alison DiLaurentis, only Aria, Emily, Spencer, and Hanna know they have been framed and resolve to beat Ali at her own game.

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.