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.

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.

In Rosewood, Pennsylvania, reporters are lined up outside the historic courthouse, typing furiously at their iPhones with freshly manicured nails. Because the trial of the century is happening right here in Rosewood: the four pretty little liars have been accused of killing Alison DiLaurentis. Only Aria, Spencer, Hanna, and Emily know that they've been framed. Ali is still out there, laughing as she watches the girls go down for her murder. But when...

Four girls living in a wealthy suburb discover the identity of a stalker who has been sending them shocking text messages, and uncover the mystery of who killed their childhood friend.