The countdown is on for the Pretty Little Liars midseason finale.

Last night's "What Lies Beneath" crossed some names off the list of Maya murder suspects, but we won't discover this culprit's actual identity until the aptly-titled "The Lady Killer" on August 28.

But fans need not wait that long for a few sneak peeks at the crucial episode.

ABC Family has released the following images from the installment, while the network also teases that "someone close to the girls betrays them" during the hour. Who will it be? In what fashion? Ponder the possibilities while you sort through these photos:

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