Pretty little liars

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—Spencer Hastings, Hanna Marin, Aria Montgomery and Emily Fields. The novels appeared on The New York Times Best Seller list for 62 weeks. The series spawned a media franchise with a television series adaptation loosely based on the novels which debuted on June 8, 2010, on ABC Family. The franchise has been licensed by Amazon.com's Kindle Worlds range of non-canon ebooks.