Tonight, the second half of Pretty Little Liars’ fifth season premiered. The episode takes place three months after Mona Vanderwaal was allegedly murdered and all eyes are turned suspiciously at Alison DiLaurentis. Even her four closest friends, or maybe ex-friends, suspect that Alison killed Mona. No one can prove it though, because Alison’s dad, Kenneth, and brother, Jason, both swear that she was with them during the time that the crime was committed.
Rosewood’s four little liars refuse to believe Alison’s alibi though, so Emily and Spencer decide to do whatever it takes to prove Alison’s guilt. They drop in at the DiLaurentis home and find Jason, whom Spencer confronts, accusing him of lying about being with Alison on Thanksgiving. At first, Jason refuses to admit that he was not with Alison, but then Spencer plays the “I’m your sister too” card and Jason’s silence says everything. After Emily and Spencer leave, Jason confronts Alison about where she really was on Thanksgiving. Alison swears up and down that she is being framed for Mona’s murder, but does not answer where she supposedly was instead.
Toward the middle of the episode, Emily and Spencer go into Mona’s home to place false evidence that Alison was indeed at the Vanderwaal home on Thanksgiving. While looking for a place to leave strands of hair from Ali’s hairbrush, Spencer looks inside the air vent and finds a hidden camera that she suspects Mona setup for evidence and safety.
After the girls tell Hanna and Aria about their find, Hanna goes to Mona’s mom and suggests that she ask the police to search her home one more time, because Mona had mentioned to her that she had wanted to set up hidden cameras around the house. Mrs. Vanderwaal follows Hanna’s advice and the police do find the hidden camera. On the camera, they see that Mona was dragged down the stairs and around the house by a blonde that looks suspiciously like Alison. The police decide the video is proof enough that Alison was the murderer and call Jason in for more questioning. This time, Jason admits that he lied about Alison being with him and that the person in the video does look like it could be Alison.
In the last few minutes of the episode, we see the police pull up at the DiLaurentis home while Alison is inside. Scared, she tries to run away, but the other four liars stop her in the yard and don’t let her pass. She argues that they are wrong. She did not kill Mona and that by letting the police arrest her, they are giving A exactly what (s)he wants. The girls don’t listen though and Alison is arrested. The final scene with the girls shows that A, presumably Alison, arranged for celebration fireworks to leave a giant “A” in the sky to scare them. The doubt is obvious in the girls’ eyes though; they seem to second guess their decision to believe that Alison is “A.”
Also throughout the episode, Aria worries about her future, because she has not been accepted by any of the schools where she has applied to attend. In an effort to find out if she or “A” is the reason that she’s not getting into the schools, she goes to Caleb to help her hack into the school systems to see why exactly she was rejected.
In addition, we watch Mike react, or not react, to Mona’s alleged death. For the most part, he seems stone cold, almost as if he doesn’t care, but then he has a talk with Aria and admits that he is hurting. He hates seeing the whole town, including Aria and the girls, pretending that they liked and knew Mona, when they didn’t know her at all. Aria asks Mike to tell her about the real Mona one day and Mike stares blankly at her before starting to cry. As Aria walks away, she hears Mike’s sobs for Mona, and stops at the exit of the living room to cry with and for him.
Finally, we see that the Young family has decided to revoke their decision to let Spencer go freely after being suspected of being Bethany Young’s murderer. However, Alison’s alleged murdering of Mona causes the police to believe she also killed Bethany, so Spencer is set free, while Alison is locked up in a prison cell.
After the episode ended and the “what’s to come” preview aired afterward, we see a brief picture of Jackie Molina, aka Ezra’s ex-fiance and one of Aria’s personal enemies. It is unknown at this time why Jackie would be shown in a preview for season five, when she hasn’t been seen since midway through season two, but it can be expected that if she’s showing up now, she’s going to have some major shade over her!