- The girls join forces with Mona to figure out why Ali reached out to the police. Alison's actions put Spencer in the cross-hairs of Bethany's murder investigation. Mona reveals the truth about Ali, resulting in an aching loss.
- We open on Thanksgiving Day. We see Spencer, Hanna and Emily standing next to Ezra in front of a house, looking horrified. Aria references how much blood had been inside. A police officer asks Hanna for her statement but she is too disturbed to "go back up there." They each get a text from A: "It's all your fault."
THIRTY-SIX HOURS EARLIER
We see Alison taking a lie detector test at the police station.
The girls drop by to see Mona and ask her for help. They tell her Alison's at the station and they're worried about what she might say. Mona is worried what might happen if Alison found out she helped them. Spencer doesn't think her sister's confession helps anybody. When they're alone Mona's mother asks Hanna whether "it's starting again." Hanna says only that they're all afraid of Alison.
Mona sends out a "Code A, she's plotting something big." Mona goes to the meeting but finds only Lucas there. Alison has "gotten to" everybody else and Mona is now considered the crazy one.
Mona tells the girls that Alison voluntarily took a lie detector test. She says she thinks that Alison is A. Spencer and Mona believe Alison probably put everything on them. Mona is going to try and find out exactly what Alison said.
Emily and Paige talk in the hallway for a few moments before Paige kisses her. Emily seems to like this development.
Aria and Ezra make pumpkin pie together ahead of him going to her family's place for Thanksgiving dinner. She makes him aware that he'll be evaluated since they're spending more time together.
Toby reminds Spencer that his police academy graduation ceremony is that night. She gives him an engraved pocket watch as a present.
Lucas drops by the police station, saying he's there to apply for a high school liaison program. When the officer steps away to grab the application he attaches something to the computer which allows Mona to remotely hack the system and copy a bunch of files.
The girls help Emily decorate her house for the holidays. Hanna gets a call from Mona, telling Caleb it's her mother. He figures out afterwards that she was lying.
The girls and Mona watch video of Alison's lie detector statement. She tells the officer that Spencer was angry that night and was under the influence of methamphetamines. Then Alison says she had nothing to do with Bethany Young's murder.
We see Holbrook drop by Alison's home with something to tell her. We don't hear what he tells her.
Caleb walks in to where the girls have been watching the video. Hanna told him what was going on and Mona had him help decrypt some of the files. He shows them an affidavit Holbrook sent to the DA, saying they no longer think Alison is POI in Bethany's murder. But Spencer is now on the radar screen, the thinking being that Spencer killed Bethany to gain favor with Alison. This was sent just after the police looked at Bethany's Radley file, meaning there must be something there that connects them. Spencer wants them all to go to Radley.
Spencer and Mona enter Radley dressed as nurses. Spencer is close to being late to meet Toby.
Emily invites Alison over, telling her it bothers her that they aren't talking. They agree they don't like the way things are between them.
Aria creates a distraction so that Mona and Spencer can sneak into the file room.
Outside Hanna and Caleb see Holbrook pull up. They tell Mona to get out of there.
Inside Holbrook asks Aria some pointed questions about her volunteer work at Radley.
Hanna tells Caleb that she aced her college boards and is now looking at a new collection of colleges.
Alison discovers that Emily lied to her about a text Hanna had sent when she first arrived. Alison realizes the whole thing was an act and leaves.
Paige arrives in time to see Alison leaving Emily's place. She jumps back in her car and follows.
Spencer has Mona pull a specific audio tape of Bethany. It turns out Mrs. DiLaurentis was having an affair with Bethany's father.
Spencer, Mona and Aria all appear to get out of Radley safely. Spencer talks to Toby, who gets in a car accident while they're on the phone.
The following day is Thanksgiving Day. At the coffee see that Toby broke his leg in the accident. Paige walks up and tells Emily she followed Alison to an abandoned farm. There were a dozen cars there, which Paige takes to mean Alison is building an "army of her own." At this point Holbrook walks in and arrests Spencer for Bethany's murder.
Mona's mother leaves for the trip to see family. Mona stays behind to finish listening to the Radley files, telling her she'll be on her way soon. She goes inside and we see somebody in a hooded sweatshirt watching the house.
Mona calls Aria with the revelation that Alison lured Bethany to Rosewood because she knew about the affair and was jealous. During this conversation we see somebody picking the lock at Mona's front door. They lower their hood and we see it appears to be a woman with blonde hair. Mona tells Aria this means that Alison is A and she can prove it. She turns around as the person opens her bedroom door.
Spencer, Aria Hanna and Ezra arrive at Mona's and find blood everywhere. Two of them go upstairs and we hear a scream.
Cut to the scene from the opening. Holbrook tells the media that there was enough blood to rule that Mona was murdered, though no body was found at the scene.
We cut to someone removing the baby Jesus from Emily's nativity scene and replacing it with Mona's doll. It then shows the person putting the baby Jesus into an open trunk with Mona's body inside.
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