Shana returns to Ravenswood to tell Emily that she has a message from Ali, but can Emily and the girls trust Shana with all that they know about her? And when Shana ups the stakes and says that Ali wants to meet Emily - and only Emily - could it all be part of an "A" plan, or is Emily really Alison's favorite? With Emily becoming more hopeful by the minute, Spencer is determined to not let her friend get hurt.
Meanwhile, Aria and Hanna deal with matters of the heart.
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.