'Pretty Little Liars' Halloween: Aria disappears, Ashley Marin is a naughty nurse

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We've got a few new juicy tidbits about the "Pretty Little Liars" Halloween special, "PLL" fans. First off, ABC Family has released some new pictures featuring Adam Lambert and Lucy Hale, plus Laura Leighton's Ashley Marin is going as a naughty nurse for Halloween, apparently. Rowr.

Meanwhile, in the above behind-the-scenes clip, Lucy Hale teases what happens to Aria during the train ride:

"My character actually disappears and you later find out what happened while she disappeared, which is a huge bombshell. Further complicates the mystery of everything. And that's basically what happens," says Hale.

Hmm. We wonder if Aria's disappearance is tied in to who dies ...

The "Pretty Little Liars" Halloween episode airs Tuesday, Oct. 23 at 8 p.m. ET/PT on ABC Family.

Photo/Video credit: ABC Family