Sara Shepard

After their friend who has been missing for more than three years turns up dead, four former best friends continue to receive frightening messages from someone who knows damaging secrets about them.

Spencer, Hanna, Aria, and Emily, friends since seventh grade at the exclusive Rosewood school in Pennsylvania, find their history of telling small, convenient little lies catching up with them when a mysterious person named A begins making threats, hinting that he or she knows what really happened to their murdered friend Alison.

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.

Forgetting the lessons they should have learned after being stalked by "A," Hanna, Spencer, Emily, and Aria-- high school juniors in Rosewood, Pennsylvania--return to their wicked, deceitful ways, but this time the consequences will be deadly.