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*might be a spoiler for you* Pretty Little Liars is about 4 girls(actually5) that are being stalked. They best friend Ali is missing and they do not know if she is dead or alive. She ends up missing and they start getting texts from "A". They know figured out that "A" was Hanna best friend Mona. Mona was put into an insane asylum, but hmm the texts are still coming.
I personally do not know who the real "a" is, but I think it might be Ali`s twin sister according to the books. If it is then why has Jason not said anything!
I think Mona wont live much longer according to the last episode.