The day has finally arrived for Alison's first day back at Rosewood High, however, neither the girls nor Alison are ready for it. Determined to put on a brave face, Alison returns to also help heal the damage she did years ago. While Spencer's family thought that Mrs. Hastings was at a spa, really she was having a private investigator finding out that Mr. Hastings and Melissa weren't at a dinner as they said. Mrs. Hastings is leaving town alone after a failed attempt to bring Spencer. Aria still suffers from the accident in New York and meets the returning Jenna, who is still grieving for her beloved's death. Mona prepares her "army of losers" for the upcoming war against Ali, which escalated with a meeting between the two that ends in favor of Mona. Meanwhile, Caleb returns to Rosewood and leaves Hanna confused for the reason of his homecoming. Emily and Alison share a kiss along with Ezra and Aria. In the end, while the police are giving an interview about the dead girl in Ali's grave, 'A' makes her triumphant return to Rosewood by putting a bomb in Toby's house and making the entire house explode. The liars are left shocked.