The episode follows the Liars—Aria, Hanna, Spencer, and Emily—during the Halloween of 2008, when Alison DiLaurentis was still the undisputed "Queen Bee" of Rosewood.
Is under immense pressure to win a school election, leading to Alison manipulating the results in her favor. The Origin of "A" [S2E13] The First Secret
Grapples with her sexuality, allowing a false rumor about a boy to persist to hide her true feelings. The episode follows the Liars—Aria, Hanna, Spencer, and
Fans often cite this as a top-tier episode because it fills in essential gaps in the Rosewood lore. It highlights Alison’s manipulative nature and the complex power dynamics she held over her "friends," while also planting early clues about the and the identities of those who hated her most, such as Lucas and Mona. Pretty Little Liars S2.E13 “The First Secret” Fans often cite this as a top-tier episode
"The First Secret" reveals that Alison was being stalked long before the other girls were. Throughout the episode, she receives threatening texts and a package containing a creepy voodoo doll with the message: “It’s my turn to torture you” . This suggests that "A" (later revealed to be Mona Vanderwaal) was already active and targeting Alison months before her disappearance.