A film projector reveals a major clue on Pretty Little Liars this week, while Aria bonded with Jason and Emily actually proved useful. What did you think of "The Devil You Know?"

Next Monday, meanwhile, look for the girls to receive a shock when Alison's mother shows up. She'll be in town for the annual Rosewood Charity Fashion Show and she'll ask Hanna, Spencer and company to walk the runway in honor of her deceased daughter.

Check out the official trailer now for "Never Letting Go."

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.