Aria, Spencer, Hanna and Emily, four estranged friends whose darkest secrets are about to unravel. One year ago, Alison, the Queen Bee of their group, disappeared and the girls swore they'd never tell what really happened that night. They thought their secrets would bond them together, but just the opposite is true. Then again, who's to say what the truth is in Rosewood. It seems everyone in town is lying about something.