10/10/2012 06:34 pm ET

'Pretty Little Liars' Halloween Special 2012 Sneak Peeks

ABC Family's "Pretty Little Liars" may not be returning for the latter half of Season 3 until 2013, but in the meanwhile, there's the highly-anticipated Halloween special coming up on Tues., Oct. 23 at 8 p.m.

Check out four sneak peek clips from the special below to see Hanna (Ashley Benson), Aria (Lucy Hale), Spencer (Troian Bellisario) and Emily's (Shay Mitchell) costumes, find out who chokes during the festivities and see what Mona's (Janel Parish) been up to below.

Mona is still at Radley, but she's not quite so quiet while she's alone. She's painting a bust -- with some smeared lipstick, or blood? -- and talks about how much she loves Halloween, as she looks at her notorious black hoodie. "Tricks and treats, treats that turn into tricks. It's better than Christmas," she eerily says in the sneak peek below.

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Apparently, Spencer and Toby are going as Lauren Bacall and Walter Brennan in the 1944 classic "To Have and Have Not" because at the start of this clip, she tells him, "If you need me, just whistle. You know how to whistle, don't you?" Unfortunately, the preppy little liar is still with Toby, who was revealed as part of the A team in the Season 3 fall finale. We also find out that Garrett is apparently missing, but before we learn what happened to the officer-turned-suspect, someone starts to choke at the party.

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Guest star Adam Lambert, the performer on the Halloween party train, stops to chat with a lonely-looking Aria, who's sans Ezra. He asks her her name as another train whizzes by so due to the noise, Aria writes her name with her finger on the window. Something tells us this will come back to haunt her. Someone, presumably A, in a frightening jester mask is looking on. S/he has some white powder in his/her ring. What could it be?

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In the final Halloween sneak peek clip, Emily finally pops up and the girls and their significant others -- sans Ezra (Ian Harding) and Caleb (Tyler Blackburn)-- dance around as Adam Lambert takes the stage.

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Tune in for the complete "Pretty Little Liars" Halloween special airs on Tues., Oct. 23 at 8 p.m.

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