who is a in season 3 of pretty little liars?
The third season takes place five months following the discovery that Mona Vanderwaal (Janel Parrish) was the elusive "A" that had been creatively and relentlessly tormenting the four main characters, Aria Montgomery (Lucy Hale), Spencer Hastings (Troian Bellisario), Hanna Marin (Ashley Benson), and Emily Fields (Shay ...