When the Girls accidantly runs A over With a car, A looses her or his cellphone, and they manage to hack some of the information in A`s phone. They find a video of Alisons Brother Jason, Melissas ex boyfriend Ian, a police officer named Garret, and Melissas sister Spencer. They talk about Alison, and they apparently had a Club in high School called N.A.T Club togetherr. This makes all of them important persons in the Puzzle.
The girls also find a video tape of Alison the day she went missing, kissing with Melissa Ex Ian. This leads them to believe that Ian may have killed her or maybe he`s A)
At the end of season 1, the girls lead Ian into a trap. He desperately want flashdrive with a video of him and Alison kissing. Ian almost kills Spencer by trying to push her down from the bell tower, but then someone in a black hoodie saves Spencer and pushes Ian instead.
When the police arrives to the crime scene Ian`s body is gone, and the police thinks the Girls just made it all up
In season 2 the police finds Ian, and it looks like a suicide. The girls manages to find out that A had written fans suicide note, and also killed Ian
So after finding out Ian wasn't`t A, and not responsible for Alison murder, season 2 continous with the girls trying to figure out who A is.
Season 2 ends at a masquerade ball, and the girls reveal that A is Mona. Mona who the girls used to bully when Alison were alive, and the girl who now was the IT girl at school. Turns out she was mentally ill. This led her to becoming a patient at a mental health institution called Radley
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The girls feel like they ca`t go to the police with the evidence they find, because A has so much on them, that could potentially destroy their lives