When dealing with matters of the heart, people react in many different ways: Still crushed over her break-up, Spencer continues her downward spiral as she now takes her anger and hurt out on Mona. Caleb, on the other hand, hides his pain by being closed off when discussing his father. But when Hanna devises a plan to bring father and son back together, will that help Caleb heal old wounds or just make things harder? And Aria, who is still missing Ezra, finds she is spending more time with Wes.
Meanwhile, Emily and Jason work together to put together the pieces of Ali's trip to Cape May and what really happened during that vacation.
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.