"Pretty Little Liars is a series of young-adult novels by Sara Shepard. Beginning with 2006's initial novel of the same name. The series follows the lives of four girls \u2013 Spencer Hastings, Hanna Marin, Aria Montgomery, and Emily Fields.The novels have appeared on the The New York Times Best Seller list. A hit television series adaptation loosely based on the novels debuted on June 8, 2010 on ABC Family. The franchise has been licensed by Amazon.com's Kindle Worlds range of non-canon ebooks."@en .