In the Pretty Little Liars Season 4 Halloween episode, the Liars were burdened with their biggest secret yet — that Alison DiLaurentis (Sasha Pieterse) is really alive. Are they the only Rosewood residents in the know about this startling truth? A sneak peek from the winter premiere (Season 4, Episode 14: “What’s in the Box?”) starts to address this question.

This sneak peek opens with Hanna reporting to the other Liars that Caleb came up empty handed when he returned to "A"'s lair in Ravenswood, since "A" had already cleaned it out. Duh. "A" is almost always two steps ahead.

Then, Spencer starts to ponder if the Liars are really the only ones who know the truth about Ali. "I wonder if Ali reached out to anyone besides us," Spencer muses.

Such as? Spencer proposes that Ali may have opened up to her big bro, Jason DiLaurentis (Drew Van Acker). But when Spence says maybe they should actually talk to Jason about the situation, Aria immediately tries to shut that idea down, reminding the Liars that they'd all agreed it was too dangerous to tell anyone.

That said, Jason is back this season, so hopefully we'll find out what he does and doesn't know soon.

For now, here's the sneak peek to enjoy: