'Pretty Little Liars Season 2 finale pictures: 'unmAsked' ball at Rosewood

The "Pretty Little Liars" Season 2 finale is still a few weeks away, but ABC Family has released pictures and an episode description to whet our appetites for what is to come. We love the above picture because of the gowns, but we think the picture below most intrigues us - what did Melissa just walk in on?

See all the pictures in gallery form here.

The episode description reads:

"Aria, Emily, Hanna and Spencer finally come face-to-face with their tormentor in "unmAsked" ... Rosewood's Junior League Masquerade Gala is the perfect setting for "A's" next game of cat and mouse with his/her favorite targets. But with Aria, Emily, Hanna and Spencer fast on his/her heels, will this game be "A's" last?"

Also, the pictures really have us wondering - where does "Psycho" fit into all this? Remember how executive producer Marlene King told Zap2it the Hitchcock film the show is doing an homage to this time around is "Psycho"? Hmmm.