After high school juniors Spencer, Emily, Hanna, and Aria think they have seen Ali, their missing and presumed dead friend, they pursue clues from a mysterious stalker, trying to find out if she is still alive.

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 twelfth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. High school seniors Aria, Emily, Hanna, and Spencer have made some terrible mistakes, but nothing compares to what they did last spring break. Now the girls are packing their bags for a Caribbean cruise, hoping the trip will be a much-needed vacation from their stalker, A. But they should...

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.

#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

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The sixth 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 lying ever since they became friends with beautiful Alison DiLaurentis. And their bad-girl ways didn't die with her. Hanna's on a mission to corrupt Rosewood's youth, starting with a very attractive sophomore. Aria's snooping into her boyfriend's past. Spencer's stealing-from her family....