Credit: ABC Family

Could Mrs. Grunwald be any more foreboding?

The Pretty Little Liars Season 4 Halloween episode is shaping up to be one of the scariest episodes of the series — in fact, if you ask Lucy Hale, it’s the best hour of PLL ever! So what can we expect?

In a newly released sneak peek, via TVLine, “A” is done playing games with the Lairs as the search for Ali reaches a boiling point. At one point, we even see Spencer hit the mysterious masked stranger over the head! But perhaps the most chilling part of this sneak peek preview is Mrs. Grunwald’s ominous message to Spencer, Emily, and Aria.

“One of you has been touched by the one who Alison fears the most,” she says. Could she be referring to Ezra? At the end of the summer finale, viewers were shocked to see Ezra run into “A’s” lair. Is he “A”? Has he been in charge of the mayhem this entire time?

Of course, that’s the most obvious answer. Grunwald could also be referring to Wren, who as we know, has “touched” Spencer. (He’s also touched Hanna, but she was conveniently missing from this scene, which could be another hint that Wren is actually the man behind it all.)

Watch the sneak peek over at TVLine and tell us what you think. Do you think Grunwald is referring to Ezra? Or is she implying someone else is after Ali and the Liars? Sound off in the comments with your theories!

Catch the Pretty Little Liars Season 4 Halloween special on Tuesday, October 22, 2013 at 8 p.m. ET on ABC Family, followed by the series premiere of Ravenswood!

Crystal Bell is an editor at Wetpaint Entertainment and our resident fan-girl for all things Pretty Little Liars. Follow her on Twitter and Google+!

Credit: Celebified Photo: Pretty Little Liars Halloween Special "grave New World" Preview Photos: Ezra Lurks In The Shadows While The Girls Search For Ali!