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.
s04e01 - A is for A-L-I-V-E
s04e02 - Turn of the Shoe
s04e03 - Cat's Cradle
s04e04 - Face Time
s04e05 - Gamma Zeta Die!
s04e06 - Under the Gun
s04e07 - Crash and Burn, Girl!
s04e08 - The Guilty Girl's Handbook
s04e09 - Into the Deep
s04e10 - The Mirror Has Three Faces
s04e11 - This Hoe is Going Down
s04e12 - Now You See Me, Now You Don't
s04e13 - Grave New World
s04e14 - Who's in the Box?
s04e15 - Love ShAck, Baby
s04e16 - Close Encounters
s04e17 - Bite Your Tongue
s04e18 - Hot for Teacher
s04e19 - Shadow Play
s04e20 - Free Fall
s04e21 - She's Come Undone
s04e22 - Cover For Me
s04e23 - Unbridled
s04e24 - A is for Answers
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.