"A" is the pseudonym used by several mentally ill women who stalk, blackmail, manipulate and torture the Pretty Little Liars, a group of five girls from Rosewood High School, and murder people close to them in revenge for things that negatively altered their lives. They send harassing messages, threaten them with incriminating evidence, and send riddles. They wear a red cloak and a mask made to look like Alison DiLaurentis, the Liars' missing leader and founder of A-game. They have a doll motif.