How many books are in the Pretty Little Liars series?
Pretty Little Liars (book series)
Alison DiLaurentis: Alison is the former "Queen Bee" of her clique, consisting of Spencer, Hanna, Aria and Emily. She had supposedly been killed at the beginning of the series however is revealed to have been alive and also their tormentor "A" as she was mistaken for her twin sister Courtney who pretended to be like her and was sent to The Preserve at Addison-Stevens, which she believed was the Liars' fault and has been plotting revenge ever since.