The season centers on a relentless, anonymous blackmailer known only as . This figure begins sending the girls cryptic and threatening messages containing secrets that only the missing Alison could have known. Even after a body—initially believed to be Alison’s—is discovered buried in her former backyard, the messages continue, forcing the four "Liars" to reunite to uncover "A's" identity and the truth behind Alison's fate. Key Characters & Season 1 Arcs
Each protagonist faces individual challenges that "A" exploits throughout the 22-episode season: Pretty Little Liars Season 1
Pretty Little Liars Part 1 (TV). (Contains spoilers) - Bookmarkedd The season centers on a relentless, anonymous blackmailer