- Radley Sanitarium gives Mona a clean bill of health, and she heads back to Rosewood High, much to the liars' dismay.
- Open with Mona sneaking into Hanna's room at night. She swears she's on new meds and has had a breakthrough. She's scared because her parents are forcing her to return to Rosewood High.
We see a car closely following a skateboarder and attempting to run him over. Toby is behind the wheel.
Wayne is putting in new alarms on all the family's windows. He's be able to control it via a smart phone app. He tells Emily that Garrett's mother is going after the Rosewood police and will be holding a public meeting. Emily isn't so sure Garrett was an "innocent" victim. He doesn't want Emily to leave the house.
Spencer and Aria talk about Mona being back. Spencer thinks she might know something and wonders if she had a connection to the NAT club.
Hanna tells Regina about Mona. Regina believes that people can change.
Emily wonders if perhaps they all should be friends with Mona. Aria is angry about the speculation regarding her father and storms off, ignoring Mona when she says hello.
Inside school Aria admits to Emily she hasn't told Ezra about his son. They spot Meredith working as a sub for a teacher on maternity leave.
After class Meredith tells the girls they need to focus on history, not her past.
Somebody knifes a brain to the inside of Mona's locker with the message "It takes one mad cow to know another." Dozens of students watch as Mona walks the brain to the trash can and throws it in. She whispers something to Lucas.
In the bathroom the girls worry the perception will be that they put the brain in Mona's locker. Mona walks in and says she knows she'll have to continue to work to earn their trust.
Hanna and Caleb talk about Mona. She wants Caleb to talk to Lucas about his limp.
Emily's parents continue to bug her about not lingering away from home. She spots the desk guy Harold from the Lost Woods working as a janitor at the high school.
Spencer asks Toby if he knows why Jenna might have transferred. He's annoyed she's still obsessing. Mona and Jason seem to be friendly.
Emily and Hanna walk down to Harold's office. They see Mona's stuff.
Aria seems to be considering telling Ezra. She gets a text from Hanna about Harold. Outside Ezra's door Aria finds a huge "It's a Boy" package with a note: "Like babies, likes grow bigger. Then they start talking. When will YOU?"
Spencer asks Jason about his relationship with Mona and advises him to be careful. Jason responds that he likes to give people the benefit of the doubt.
The girls think there must be a connection between Harold and Mona. Caleb finds a transcript between Mona's family and the principal. Mona apparently begged to come back to Rosewood.
Spencer tells Toby she's worried nobody has Jason's back.
Aria and Byron talk about Meredith. Meredith told him positive things about the girls. She asks Byron if he spent time alone with Alison and this seems to concern him.
Hanna and Regina watch a video of Mona. Regina isn't buying her complaints of bullying. Lucas drops by with money for Caleb. He says he hurt his leg skateboarding. He knows Mona had been sneaking out for some time.
Everybody at the run seems to be watching Mona's video. Aria asks Caleb about his father.
After Wayne leaves the house Emily turns off the alarm and sneaks out her window.
During the race the girls sneak into Harold's office. They find a diary of Alison's. They read an entry about Alison blackmailing Byron about Meredith. She's leaving town for the visit with her grandmother and wants him to figure out how he'll pay her by the time she returns. Aria rips the entry out of the book. The girls run into Harold on their way out. They walk outside the school and see a huge fire in the school's storage shed.
Wayne and Emily talk about loss. He wants their relationship to improve.
Meredith was burned in the fire. Byron shows Aria the note that led to Meredith going to the shed. He asks her if one of her friends wrote it. He asks if she and her friends did this. Aria almost brings up Alison, but doesn't pull the trigger.
Spencer and Jason talk about the fact Mona managed to escape the first without injury. Jason says he'll be careful going forward.
Aria calls Spencer to say she thinks A set them up.
Mona is with Jason and we see that he has burn marks.
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