Filled with mystery, scandal and intrigue, the one-hour drama PRETTY LITTLE LIARS returns for another suspenseful season. Based upon the best-selling book series, the series revolves around four teenage girlfriends -- Aria, Emily, Hanna and Spencer -- who lost touch with one another after the mysterious death of a friend, Alison. The girls are suddenly reunited when they each begin receiving threatening messages from someone named "A," suggesting Alison is actually alive -- and watching them. Somehow "A" knows their most private details, and relationships were built and destroyed as secrets and betrayals continued to unfold. As the tension continued to build, the girls discovered strengths they didn't know they had and experienced scares they could never have imagined. Get ready for more twists and thrills as season four of PRETTY LITTLE LIARS begins in the moments following the shocking season three finale and the girls strive to make sense of the mysterious "Red Coat" and what plans he or she may have in store for them. The series regularly generates media buzz and the season three finale was the #1 most social program across all of television and the first series in TV history to ever amass over +1.0 million Total airtime tweets.