They start receiving mysterious messages from an anonymous source named “A,” who threatens to expose their deepest secrets.

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The first three and a half seasons of the hit TV series "Pretty Little Liars" are built on finding ... she received messages and texts from A well before any of the others. Between this and ...

Mystery–thriller series Pretty Little Liars (PLL) premiered on ABC Family ... goes missing when they start receiving threatening messages from a mysterious figure called “A.” ...

Troian Bellisario revealed on the Wednesday, Jan. 29, episode of Sophia Bush’s podcast, 'Work In Progress,' that she 'always felt like the older sister' to Her 'Pretty Little Liars' castmates, Shay ...