'Pretty Little Liars' finale sneak peek: Hide 'n seek with A

"Pretty Little Liars" capped off a jam-packed episode Monday night (March 12) with the creepiest scene we think the show has ever done, as the dolls were coming to life in the doll hospital. Only one more episode this season, Liars fans! Here's a sneak peek clip.

In the clip, the girls receive their invites to the Rosewood Junior Society Masquerade Ball. A leaves them notes. Emily says that A wants to play hide 'n seek. Aria's note says, "Be there when the clock strikes midnight." And Spencer reveals hide 'n seek was her favorite game with Melissa - because she always won.

We love Spencer's determined face. She's so great when she's being a rock star. The "Pretty Little Liars" finale airs Monday, March 19 at 8 p.m. ET/PT on ABC Family. We can hardly wait.