Credit: Video Still

Ready to be scared, Pretty Little Liars fans?

In this sneak peek of Season 3, Episode 15: "Mona-Mania!" (January 15), the girls go hunting for clues, but they end up getting an unexpected — and unpleasant! — surprise.

Check it out below.

Credit: YouTube Photo: Pretty Little Liars Season 3, Episode 15 Sneak Peek: "It's Like He Was Never Here" (VIDEO)

Find more Pretty Little Liars spoilers here.

Catch the next episode of Pretty Little Liars on Tuesday, January 15, 2013 at 8 p.m. ET/PT on ABC Family.

Rebecca Martin is an editor at Wetpaint Entertainment. Follow her on Twitter @BeccaDMartin.