Ali's pretty little lies

Before she was murdered and became "A" to the rest of the "Pretty Little Liars" girls, she was Alison DiLaurentis, the most popular, most beautiful, most dishonest girl in Rosewood Day. She had dirt on Emily, Hanna, Aria, and Spencer, enough to keep them from usurping her authority over their clique. However, Alison had a secret worse than all of theirs combined, and in trying to cover it up she set herself in the murderer's sights.