What is the "Pretty Little Liars" series about?

"Pretty Little Liars" is a teen drama series that follows a group of four girls after the disappearance of their leader. This television series is loosely based Sara Shepard's book series by the same name.

In "Pretty Little Liars," the four friends grow apart in the wake of their friend's disappearance. One year later the group is suddenly brought back together by a series of mysterious text messages threatening to reveal their darkest secrets.

As of 2015, the show is in its sixth season and has been renewed for a final seventh season. "Pretty Little Liars" airs on Tuesdays at 8 p.m. on the ABC Family Network.