- The girls go to the hotel Ali checked in before she disappeared. Spencer discovers Mona's secret. Dr Sullivan comes back to Rosewood.
- The liars finally come face-to-face with their tormentor; Rosewood's Junior League Masquerade Gala is the perfect setting for "A's" next game of cat and mouse with their favorite targets, but will this game be "A's" last?—ABC Family Publicity
- Open with the girls watching a TV report on the case against Garrett, which seems to be based on the missing page of the autopsy report. Melissa walks in acting strange and says if Garrett killed Alison there was a reason. Emily gets text from A saying if they don't bring the "something that belongs to me" one of them will die. They assume this is a reference to the phone. A messenger delivers invitations for a costume-required "Masquerade Ball" held by the Rosewood Junior Society. A wants to play hide-and-seek, telling them to be there at midnight.
The girls seem intimidated by going against Melissa's brains if she is in fact A. Spencer has no desire to return the phone, meaning they need to unmask A before the following night. Mona is also going to the party and wants to go shopping. All the girls make up excuses.
Aria thinks it might really be over be over with Ezra. Mona sends Hanna a text saying she knows she lied about not being able to shop with her. Aria tells the girls about sleeping with Ezra. The girls find evidence of a resort named Lost Woods that Alison may have visited after Duncan flew her to that airstrip.
That night the girls drive to Lost Woods. A manager checks in Spencer, who uses a fake name. Spencer asks to stay in room 1, which they believe is where Alison stayed.
Aria and Spencer leave to try and get a look at the registration book, while Hanna and Emily stay behind. While Hanna is in the shower Emily gets a call from Maya. She goes outside to get a better signal, leaving Hanna alone.
Spencer and Aria see that Alison checked in as Vivian the morning before she went missing.
Somebody enters the room, then the bathroom, but disappears when Hanna's phone rings. She goes out into the room and finds the door wide open.
Somebody in a room next door is spying in the girls through a peephole. Spencer has stolen the registration book and sees that Alison stayed in the hotel twice. Emily is going to be Hanna's date for the dance.
Spencer asks Toby if he'll ever forgive her. He brushes her off. Spencer leaves and Toby gets a call from Dr. Sullivan.
Jenna meets with someone. She hands them something and says "they're all going to be at the party. You know what you need to do."
The girls arrive at the ball. Caleb surprises Hanna by being there. Mona helped him with his costume and isn't angry with Hanna. Mona tells Spencer she took Caleb shopping at a store in Broohaven, the last place she saw Alison alive. We flash back to Mona running into Alison wearing her Vivian disguise. Alison tells her she's watching someone and wants Mona to leave. Mona says she'll do it if she can be popular. Alison writes a number on a piece of the Lost Woods postcard. In present day Spencer thinks this story means that Alison was watching A. We see Jenna arrive at the party.
Ezra also is a surprise attendee. He and Aria embrace.
Spencer has figured out that Alison was staying in Room 1 at the motel and spying on A in Room 2 -- which has remained rented since Alison went missing. She and Mona are headed to Lost Woods and she calls Emily with the update. Emily says she has two hours to return.
Spencer sits with the Lost Woods manager while Mona snags the key for Room 2. They open the door and gasp.
Ezra and Aria kiss on the dance floor. Paige taps Emily on the shoulder.
Room 2 is essentially "A's lair," covered from floor to ceiling with pictures and news clippings.
Paige tells Emily she feels they have a connection and wants to be there for whatever she needs. They agree to be friends.
In Room 2 the girls find a drawing of A's dress, which is the Black Swan. They try to call Aria and Emily but neither answers. Cut to Jenna arrives at the party in the dress. Spencer recalls that Melissa had been the black swan at a charity ball the previous year. Spencer sees that A has marked a page in her diary with a gum wrapper. She recognizes the same brand of gum Mona had offered her previously. Spencer asks Mona for that piece of gum she had offered before, and Mona says she has to leave to get more from the car.
Lucas is at the ball as well and is talking to a woman they can't recognize.
Mona returns to the room dressed in black. Spencer figures out that she is A and Mona doesn't deny it. Mona then hits Spencer in the head with something. Spencer wakes up in Mona's car.
The girls notice that Hanna's phone has been set to record audio every time it is turned on.
While Mona speeds along a winding road she tells Spencer her options are to "join the A team or disappear." Spencer dials Aria so the girls can hear that Mona is A and that they are headed to Lookout Point. Mona seems to be getting revenge for the other girls stealing Hanna from her. Mona says she has Spencer's father's gun Spencer jumps out of the car just as the other girls pull up. Hanna very nearly runs Mona over, but thinks better of it. Mona and Spencer struggle at the edge of the cliff and eventually Mona falls over.
Dr. Sullivan meets the girls at Lookout Point. She said A threatened her son. Hanna is distraught and Sullivan comforts her.
Mona survives the fall. Sullivan explains that Mona was dealing with a severe personality disorder. We can hear Mona's thoughts. She doesn't think it is over.
Outside Sullivan tells the girls it was Toby who helped her push through her fears. Spencer and Toby embrace and kiss.
As the girls walk closer to home they see ambulances. Emily sprints towards them and finds her mother. She says they've found a body and "think it's Maya."
As the episode ends Mona has a visitor in the mental facility. She looks at up at them and says "I did everything you asked me to."
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