In the special Halloween episode, Aria, Emily, Hanna and Spencer crash the Ravenswood Founders Day Celebration after a clue in "A's" new lair suggests that Ali may indeed be alive. Dressed in their finest Edwardian wear, the ladies hit the creepy cemetery party to find Ali before "A" can. But if Ali is truly alive, could the PLLs be leading "A" straight to their friend without knowing it? With Ezra lurking in the shadows, "A" may be closer than the girls realize. Meanwhile, Caleb heads to Ravenswood to help the girls and meets kindred soul Miranda (guest star Nicole Gale Anderson – Beauty and the Beast, Make It or Break It) along the way.