Alison's trial gets underway and her confidence is rattled as lies are exposed. Meanwhile, Hanna's friends try to free her by investigating clues left by either Mona or "A."

"A" has always had fun playing with Aria, Emily, Hanna and Spencer, but now "they" have the biggest game to date in store for the girls. As shocking secrets come to light and the biggest clue to the "A" mystery is revealed, is this one plAydate the Liars can survive?