"Pretty Little Liars" follows four estranged best friends who are reunited one year after their best friend and queen bee of the group, Alison, goes missing only to discover they are receiving messages from an anonymous "A" who knows all their secrets.

"Pretty Little Liars" follows four estranged best friends who are reunited one year after their best friend and queen bee of the group, Alison, goes missing only to discover they are receiving messages from an anonymous "A" who knows all their secrets.