The latest preview for Monday's new episode of Pretty Little Liars teases an upcoming betrayal - and the slew of clips we've posted below from "A Kiss Before Lying" make it pretty clear just which Liar may be getting betrayed.

Simply put, it won't be a fun hour for Hanna, as her friends mislead her and her evil step-sister starts school at Rosewood High.

What else is on tap, based on the following sneak peeks? A reminder to Emily that a certain stalker isn't through with her yet. Sit back, watch and enjoy!

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