[Arria / Hannah / Spencer / Emily] pool their close friendship,
But their friendship dissolved when their friend Allison disappear mysteriously and suddenly.
After years of separation /. Returns from a new friendship when they receive threatening letters from "A"
And the series is adapted from a series of stories with the same name by writer Sara Shepard
Genre: Teen Drama | Mystery
Created by: Marlene King
Airing Channel: ABC FAMILY
