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According to Janel Parrish (Mona Vanderwall), yes, definitely. Janel told E! that "Emily will start piecing that night together," and we will find out more "about how all that happened."
She also hinted that "Mona is going to be, you know, progressively crazier." Given that she's already at the "stabbing herself with tweezers" level of crazy, we're a little scared of what she'll do if she gets more deranged.
Catch an all-newepisode of PLL on Tuesday, June 19 at 8 p.m. ET/PT onABC Family.