Pretty Little Liars: Who's A?

Okay, so I know everyone is interested in the Pretty Little Liars Series. I know that the first "A" is Mona until Mona dies. How does Mona die? Then Alison becomes "A" because Alison's twin Courtney was the one who died and that was who Aria, Spencer, Emily, and Hanna were friends with. ... show more Okay, so I know everyone is interested in the Pretty Little Liars Series. I know that the first "A" is Mona until Mona dies. How does Mona die? Then Alison becomes "A" because Alison's twin Courtney was the one who died and that was who Aria, Spencer, Emily, and Hanna were friends with. But how does Mona and Alison know all their secrets?
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