The Pretty Little Liars' are in for a shocking Christmas episode.

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The Liars will head to the Ice Ball during "How the 'A' Stole Christmas," and, if the Rosewood pal's looks of astonishment are any clue, 'A' will have a few tricks up his/her sleeve (see photos here).

As the icy chill of December settles over Rosewood, Hanna (Ashley Benson), Aria (Lucy Hale), and Emily (Shay Mitchell) will split their time between holiday preparations and working to clear Spencer's (Troian Bellisario) name. Don't worry, however. Even though Spencer is a murder suspect, she will still be out and about during the episode.

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Mona, meanwhile, will make her ghostly presence felt. Alison will have a very Scrooge-esque experience this yuletide as Mona visits her in the guise of the ghosts of Christmas Past, Present, and Future. Not that this will keep Alison from making a formidable appearance at the Ice Ball with her four new cronies.

Find out more when Pretty Little Liars airs Dec. 9 at 8 p.m. ET on ABC Family. Click the video below to see a preview for "How the 'A' Stole Christmas."