POPSUGAR: So there's a new mystery on the show! Someone is coming after Ali, five years later. Obviously, you can't divulge a lot about that, but are there any clues you can give us on what to look forward to?
I. Marlene King: Well, the girls have all sort of gone their separate ways over these five years, and although they're still friends, they don't see each other regularly. So there is an event — or a reason — they come back to Rosewood. Some new secrets and lies. A new mystery unfolds. And the results of that mystery unleash a new "big bad."
PS: Does this new person, this "big bad," have anything to do with the person who killed Mrs. DiLaurentis?
IMK: . . . Possibly. [Laughs.]
PS: Are we going to find out who did it?!
IMK: We will find out who did that, yes. That's connected to this new mystery and the new "big bad" moving forward.