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Sasha Pieterse (Alison) recently spoke on the mystery surrounding A, and if we'll even begin to scratch the surface in the Halloween special episode, "The First Secret".
She also gave a teeny-tiny hint that there could be a major clue in tonight's Halloween episode, but you have to pay close attention to: the decor in Alison's room, which we've yet to see in the series.
Be sure to catch tonight's Pretty Little Liars special Halloween episode, "The First Secret"! Who will be watching? (You know, other than A.)
Source: TV Guide