it was Mona, but after she dies, a new A comes back. The new A is actually ALI. ali has a twin sister, Courtney. and she was the one that was killed. And it was actually Courtney that was friends with Spencer, Hannah, Emily, and aria. Courtney lived in a mental institute but tricked ali into going. so ali got revenge & killed her, pushing her down the hole. so ali became A to get back at the Pretty Little Liars.
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there's no Louis in pretty little liars.
No one there is no trisa on pretty little liars
No, Spencer from Pretty Little Liars does not die.
Ezra did not die on Pretty Little Liars.
All of the books in the Pretty Little Liars series