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Hanna, Aria, Emily, and Spencer are shocked to learn of the existence of Alison's twin, Courtney, when she's introduced at a press conference. Courtney had spent her life in institutions due to "health issues" and her existence was kept secret by her family. Newly released, she attempts to resume her sister's life and begins tentative friendships with Ali's old friends, even striking up a romantic relationship with Emily, who is overjoyed. Courtney later reveals that she's actually Ali; that the real Courtney had pretended to be her on the night of Ali's disappearance, and she was the one who was killed.
Meanwhile, Spencer had begun to believe that her sister is Alison's killer, but Ali is revealed to be the real killer. The girl they were friends with years ago was actually Courtney, and the real Ali was stuck in an institution. Alison killed Courtney, attempted to kill the girls in the forest fire, killed Jenna, and now plans to kill them by setting the house on fire. The girls discover that Alison killed Ian and kidnapped Melissa, who they free before escaping the burning house. Trapped inside the house, Alison is assumed dead, although her body is never found.
The ending of the book suggests that Alison survived the fire and that she and her family have moved on to somewhere else.