Alison struggles with the passing of her mother, as the Liars try to navigate through her new lie. Now being forced to live through Ali's latest lie, Aria, Emily, Hanna and Spencer try to cover their tracks, while simultaneously trying to piece together what happened in New York. Hanna and Aria have to close loose ends with the two people who know the truth about Ali's story - Mona and Ezra. Spencer and Emily try to find out the truth about Jason and his whereabouts the night they were in New York. Meanwhile, Hanna starts to examine who she really is - Hefty Hanna or Queen Bee Hanna - now that Ali is back.
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.