Dana Ward and Joslyn Davis sat down with Sasha Pieterse, who plays Alison DiLaurentis on ABC Family's 'Pretty Little Liars'. She dishes on the upcoming Halloween episode of PLL titled 'The First Secret'. The flashback episode takes place on the Halloween before Ali went missing and is told from Ali's perspective. Sasha lets us know that there will be several clues throughout the set for secrets yet to be revealed. Tune it to 'The First Secret', which airs Wednesday, October 19 at 8pm E/P on ABC Family.