Mona's mother, Leona Vanderwaal, tells Mona that she has company. Downstairs in the lounge, the liars await Mona, wanting her help. The girls are worried because Alison is taking a polygraph test and may not tell the police the truth. Spencer says that a lie is halfway around the world before the truth has a chance to get its pants on. Hanna states that the liars have been lying for Alison ever since she got back to Rosewood, so they need to know which story Alison is telling the cops. Mona asks why they think she can help them, to which Aria replies, "Because you're Mona".
Back at the police station, the test instructor asks Alison about the night of Bethany Young's murder. He asks her who else was in the barn that night. Alison answers that Aria, Hanna and Emily were, and confirms that when she left the barn the three of them were still sleeping. The instructor then asks Alison where she last saw Spencer Hastings that night.
Back at the Vanderwaal house, Mona tells the liars that Alison stole her life from her when she crowned her Rosewood's biggest loser. Mona tells the liars that Alison was so convincing that even Mona was starting to believe her. Hanna asks whether this means that Mona will help the liars. Mona explains that even though she owes the four liars for everything that she has done to them in the past, she is worried to what Alison will do to her if she finds out that she has teamed up with the liars. Spencer asks Mona if she is really that scared of Alison, with Mona directing the question back at her. Spencer looks on while Hanna exchanges looks. Mona asks the liars if they have ever been so focused on one thing that it took them over and turned them into someone else. Mona apologizes for taking out her "Alison anger" on the girls. The liars acknowledge her apology and begin to leave, but Hanna stays behind to get cookies from Leona.
As Spencer, Aria and Emily reach the door, Aria asks Spencer if she has decided what she is going to do with Melissa's recording. Spencer states that Melissa sent her the video to make sure she knew the truth, but the confession does not actually help any of them. Emily sees this as a straight up confession, but Spencer says Melissa buried Bethany alive to protect Spencer. Aria counters that Spencer didn't actually hit Bethany. Spencer says it doesn't matter, as in the best case scenario, she herself is still an accessory to murder. As Hanna receives the cookies from Leona, Mona tells Hanna that she will see her at school, and goes back to her room. Leona asks Hanna if the bullying has started again now that Alison is back. Hanna tells her that she does not know what Alison is doing, as they are not friends anymore; however, she does believe that Mona is afraid of her, and adds that they all are.
Back in her room, Mona dials someone and says, "Send out a code 'A'. She's plotting something big".
With Alison leading them down a dangerous path and “A” barring them from telling the police the truth, Aria, Emily, Hanna and Spencer feel trapped and are desperate to find a way out of this mess by joining forces with Mona, resulting in an aching loss. Meanwhile, Alison begins to build up her own army now that the PLLs have turned their back on her and Spencer ends up in the cross-hairs of Bethany Young's murder investigation. #PLL #PrettyLittleLiars #FAtalFinale
