Pretty Little Liars is an American teen drama mystery-thriller television series based on the popular series of novels written by Sara Shepard. The show premiered on June 8, 2010 on ABC Family.Pretty Little Liars is the story of four teen girls—Aria, Hanna, Spencer, and Emily— whose world is turned upside down when their ringleader Alison goes missing.Aria has been abroad for a year with her family, and the other three girls have drifted apart. One year later, they begin receiving messages from a mysterious figure using the name “A” who threatens to expose their secrets. At first they think it’s Alison herself, but after she is found dead, the girls realize that someone else knows their secrets—including long-hidden ones they thought only Alison knew.
After an initial order of 10 episodes on June 28, 2010, ABC Family ordered an additional 12 episodes for season one.The ratings success of the first 10 episodes prompted the book series to be extended beyond the initial eight novels.On November 29, 2011 ABC Family renewed the series for a third season, consisting of 24 episodes.The third season will premiere on June 5, 2012.