Pretty Little Liars turned the Paige last night, revealing new information about this character's past.

Is she an innocent victim? Or a totally crazy psychopath?

That's just one of the many questions fans have as we head into the painful break between "Single Fright Female" and next Tuesday's mideason finale, "The Lady Killer."

In anticipation of the murderer-revealing episode, ABC Family and Much Music in Canada are teasing the biggest betrayal in series history. By whom? Let the theories fly as you first watch the American preview:

And now from our friends up north:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.