Many people are afraid of the dark, but if you're a Liar in Rosewood, hearing things go bump in the night is a real cause for concern. In a new sneak peek for Pretty Little Liars Season 4, Episode 17 (“Bite Your Tongue”), Emily (Shay Mitchell) finds herself in a worrying position late at night.

In the clip for the episode, which you can watch below, a restless Emily hears someone making noise in her house.

"Dad?" she wonders, out loud. There's no response.

Then she notices her window is open. She gets up to close it, looking concerned. Did she not leave it open?

She hears another sound in the hall, and decides to take matters into her own hands, grabbing a pair of scissors and preparing to stab the intruder, who comes to her door and starts to open it.

The clip cuts off before we can see who's breaking in to Em's room, but we have a feeling her first guess was actually right — that this time, it is her father, and not someone more dire. After all, the synopsis for the episode says that "Emily’s dad is concerned about her behavior." Her almost stabbing him would definitely be a cause for concern.

Who do you think is behind the door? Check the sneak peek out for yourself, and then share your theories in the comments below!


Catch the next episode of Pretty Little Liars on Tuesday, January 28, 2014 at 8 p.m. ET on ABC Family.