Aria Montgomery, Hanna Marin, Spencer Hastings and Emily Fields are receiving more text messages, e-mails and notes from A. The four of them start thinking up who A could be. The four girls start talking about The Jenna Thing and what they did to Jenna Cavanaugh who is blind. Aria is still having an affair with her teacher Ezra. Emily starts dating Maya.
Never trust a pretty girl with an ugly secret. Gossip thrives amid the Mercedes-Benz, mega mansions, and perfectly manicured hedges in the exclusive town of Rosewood, Pennsylvania. Everyone has something to hide. Based off the book series of the same name, the series follows four estranged best friends Spencer, Hanna, Aria, and Emily who are reunited after their best friend and queen bee of the group, Alison, goes missing only to discover they are receiving messages from an anonymous "A" who knows all their secrets.