Pretty Little Liars is an American teen drama mystery-thriller television series developed by I. Marlene King and is produced by Alloy Entertainment and Warner Horizon Television. The series is based on the book series of the same name written by Sara Shepard. The series follows the lives of five girls – Spencer, Hanna, Aria, Emily, and Alison – whose friendship falls apart after the death of their leader, Alison. One year later, they begin to receive messages from someone using the name “A” who threatens to expose their secrets. At first, they think it’s Alison herself, but after her body …