Plot summary
It's Truth Up Day at Rosewood High, and it seems some will have more to spill than others. Spencer, Aria, Emily and Hanna deal with their own personal problems, before A exposes everything. When they see that Kate has a birthmark right above her waist, they know that the photo that was sent to everyone else was photoshopped. Hanna realizes that A hadn't sent that photo with Hanna's phone, because there was no reason for A to help Kate. In the bathroom, Hanna pushes Kate to tell the truth, which Aria and Emily record while hiding in the stalls.
They prove to the principal that Hanna is innocent. Aria is suspicious about Holden, who she thinks is "hurting himself". When Aria gets locked out on the rooftop of the school and is attacked by Noel, who is now Jenna's boyfriend, Holden rescues her by kicking Noel in the face in a very professional matter, thus revealing more about his secret. Mona and Emily become closer when Mona volunteers to find a way to get Emily back on the swim team since the principal felt Emily would tarnish the team's reputation, due to the Liars' trouble with the police.
Jason comes back to Rosewood looking for Spencer's father. During the school's Truth Up Day event, Spencer overhears Jason and her mom arguing about how everyone should "know the truth." It is then revealed that Jason and Spencer share the same father. Later on, the number they found in Vivian Darkbloom's jacket returns their call and asks to meet up face-to-face to answer some questions. ' A' ending: 'A' is seen approaching a sleeping Caleb during the night and taking his laptop out of his bag.
Credits
Adapted from Wikipedia contributors, Pretty Little Liars season 2. HTML formatting and reference markers removed.