ABC Family: Pretty Little Liars Season 1 Episode 1 FINAL PILOT

Four friends band together against an anonymous foe who threatens to reveal their darkest secrets, whilst unraveling the mystery of the murder of their best friend.

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The series follows the lives of four teenage girls—Aria Montgomery, Emily Fields, Hanna Marin, and Spencer Hastings—whose clique falls apart after the disappearance of their leader, Alison DiLaurentis, until her body is found is when they join together again at her funeral where they immediately begin receiving text messages from an anonymous source, "A", who threatens to expose their secrets—including long-hidden ones they thought only their close friend Alison knew. As the show continues they discover more secrets that can harm not only them but the ones around them. They also discover clues that may lead them to find out the identity of 'A' and Ali's death.