This Week's Pretty Little Liars Christmas Special Looks Gorgeous and Terrifying

OK, first of all: what is going on with Mona (Janel Parrish)?

I assume this is some kind of Ghost of Christmas Past kind of thing?

She's really creeping out Alison (Sasha Pieterse).

Welcome to the holiday ball!

Obviously, Aria (Lucy Hale) and Emily (Shay Mitchell) look drop-dead gorgeous.

As always, there will be drama.

Emily looks tense.

Aria goes poking around where she doesn't belong. Trouble ensues?

Detective Holbrook (Sean Faris) sneaks up on Aria.

He's definitely not drawing attention to himself in that Santa suit.

The couples get together on the dance floor.

Paige (Lindsey Shaw), Caleb (Tyler Blackburn), and Ezra (Ian Harding) congregate to look concerned.

What could they be looking at?

Spencer (Troian Bellisario) and Hanna (Ashley Benson) also look amazing.

And yet — something feels off.

Who cares? More dancing.

Emily and Paige make a very cute couple.

Uh-oh, trouble has arrived!

The gang lines up to face some party crashers.

Here they are! Alison heads up a group of masked ladies.

I trust no one! Not even Santa.

I especially don't trust Alison.

Back at the house, the gang relaxes.

They still all look adorable all dolled up.

Aw, this is cute. Glad Caleb is back.

Does this mean Emily and Paige are getting along again? Let's hope so.

They can't get too comfortable, though. There are important matters at hand!

Wait, what happened to Toby's (Keegan Allen) leg?

At least they still have each other!

This looks pretty cozy.

Ezra takes a bow.

The drama continues at the house.

Who are they looking at?

Spencer finds something bad.

Very bad.

Meanwhile, Hanna finds a birdcage.

Ohhh, and a little book!

Alison wakes up, alarmed.

The emotional and physical distance between Emily and Paige is killing me.

Hanna and Caleb have a fireside chat.

Aw, Merry Christmas from the girls!