Complete story — includes the ending
The flash drive footage, mostly in bedrooms, includes Alison so she didn't take them. But the fact she had possession of them suggests she was killed for knowing their contents. The girls confront Jenna over footage showing her saying she can cry rape on Toby. She says Alison came to hospital and blackmailed her into leaving town (Alison said the guy she liked had made the films). Spencer buys a prepaid phone, and uses it to tell Ian that they found the video and to come to the park with $10,000. Aria's mother has a get together with all of the teachers, but Aria is shocked to see Ezra's past love show up. Melissa cannot find her phone, so Spencer offers to drive her to the church to find it but the car crashes. We see Garrett kissing Jenna in her house. Emily, Hanna and Aria go to the park to meet Ian. Garrett arrives. Spencer returns to the church to look for Ian and he chases her to the top of the tower, then reveals that he knocked Alison unconscious and attacks her. Her phone is connected to the girls' and they hear what the two say. A hooded figure pushes Ian off the tower, seemingly killing him. When the police show up, they think the girls are lying because Ian is nowhere to be found.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Pretty Little Liars season 1. HTML formatting and reference markers removed. · Content license