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In the end of Pretty Little Liars, it turns out that Ali had a twin sister, named Courtney, who was fooling everyone into thinking that she was Ali. While the real Ali was in a mental institution after her parents believed that she was Courtney. The "A" from the beginning is actually Mona, and the "Pretty Little Liars" find out that it was her and Mona died. However, "A" is still out there haunting the girls after Mona dies, which means that there is still someone out there that know all of there secrets. It was actually the real Ali who wanted to get revenge on the girls.

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15y ago

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