Alison finally reveals all on Pretty Little Liars. The theme for the fourth season has been "a season of answers," and on Tuesday's episode, simply titled "A Is for Answers," viewers will get to check off one series-long question: What exactly happened the night Alison disappeared? In the… "Fans of the show have had suspicions and their own theories, so I think some of those theories will be fulfilled. But you have a lot of questions that will be answered with this episode, because you have the source right there, which is Alison," Lucy Hale told The Hollywood Reporter. "She lays out exactly what happened. Now that Ali is back, we can hopefully figure out who 'A' is." STORY: 'Pretty Little Liars' Gang on Ali's Homecoming, 'Ravenswood' Wrap-Up and Caleb's Return Executive producer Marlene King called the Pretty Little Liars finale one "we've never had before, and whenever we get to shake things up, whenever we get to do something that looks different than what we do, it's exciting." She added: "The finale leads us to a premiere that is really an extension of the finale -- it's almost like a two-part action movie," with season five picking up almost immediately after. THR caught up with the cast and producers for hints on Tuesday's finale and beyond.