13. The First Secret

It's the Halloween before Alison disappeared and where all of the secrets and lies began for Aria, Emily, Hanna, and Spencer. After meeting Jenna, Alison gets an anonymous text from a blocked number. Later, Aria and Alison go out for frozen yogurt. While they are walking, Mona sees them and calls out to join them. Aria and Alison run off in attempt to lose Mona. They turn a corner and stop in when they see Byron and Meredith making out in his car. The gang goes to a Halloween party hosted by Noel.

Some time later, Emily is sitting outside alone. Hanna joins her, wondering where Alison is. The other Liars join up, and they get a text that reads, "I’m in trouble, come alone" from Ali, directing them to the scary house's address. They find Ali in a locked room. Seemingly terrified, she recounts that someone grabbed her and brought her there threatening to kill her with a knife. Nobody can get a signal to dial 911 from their cell phones, so Ali goes out alone. Then she screams, but the door is now bolted.

Through the keyhole they see a big fight with her and costumed guy with a knife. Ali knees him and runs off, and the Liars get out through a conveniently open window. They go back in the house, and Ali is rocking in a chair, brandishing a knife and looking completely insane, but she says it was all a hoax. Noel was the zombie, and the blood was ketchup. Back at the party, Noel then approaches Ali to apologize, but she tells him it was perfect—but then realizes he's apologizing because he didn’t make it to the plot; he was stuck at the party, not because he had been too rough with her. Giant Drag guest stars.