Pretty Little Liars Season 3 (2010)

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"Pretty Little Liars" features four friends who are forced to defend their darkest secrets against an unknown enemy who calls him or herself "A." The teen thriller is based on a series of novels by Sara Shepard which follows the best friends as they try to unravel the circumstances surrounding their friend, queen bee Alison DiLaurentis' murder. One year after the murder, Spencer Hastings, Hanna Marin, Emily Fields, and Aria Montgomery struggle to keep their friendship together as they're stalked by the menacing ?A? who reveals secrets that no one but Alison would have known. Their lives threatened, the girls band together to uncover the identity of ?A? while navigating through day-to-day suburban dramas.