house. Struggling with guilt after realizing Shana was not 'A', Aria gets help from Ezra, and slowly starts to reconcile with him. Aria also begins to volunteer at Radley in order to find out information about Bethany Young, who was a patient there. Tension begins to swarm between her and Hanna when Hanna almost reveals what happened in New York to the new girl at school, Sydney. Emily tries to deal with her breakup with Paige, while struggling with her feelings toward Alison. She also helps the new girl, Sydney, with her swimming, until she finds out that Sydney knows Jenna. Meanwhile, Spencer deals with her parents splitting up and finding out what Melissa knows about the night Alison disappeared. Following several leads to find out more about Bethany, she learns that Mrs. DiLaurentis had spent some time with her. Furthermore, Melissa reveals that she was the one who buried Bethany because she was trying to protect Spencer, believing that Spencer killed the girl. As the season progresses, the four girls begin to feel uncertain about Alison and whether she is telling them the truth, and Alison begins to lose their trust. The friendship hits a breaking point when Ali has to identify her so-called "kidnapper", and the girls realize that Alison has lied to them the entire time she has been back. They ultimately decide that she can't be trusted anymore. They then set up a plan to confess everything to the police. However, 'A' stops them before they can go through with the plan, and the liars find out that Alison has gone rogue. Teaming up with Mona, they discover that the police suspect Spencer of killing Bethany Young, and that Mrs. DiLaurentis had an affair with Bethany Young's father. After telling the girls she thinks that Alison is 'A', Mona is approached by 'A' and presumed dead in the ensuing confrontation. Spencer is arrested for Bethany's murder. The Liars and their allies relentlessly pursue evidence to prove Alison killed Mona. Through the clues Mona left for them, they were able to get Alison charged and arrested for both Mona and Bethany's murders, clearing Spencer of the charges in the process. However, the girls realize someone is still helping Alison, who they now believe was trying to drag them down with her in jail. Their initial suspect is Detective Holbrook, but Holbrook reveals to Hanna that Alison cut