Pretty Little Liars is a series of young-adult novels by American author Sara Shepard, beginning with 2006's inaugural entry of the same name. The series follows the lives of four girls – Spencer Hastings, Hanna Marin, Aria Montgomery, and Emily Fields – whose clique falls apart after the disappearance of their leader, Alison DiLaurentis. The link contains the first 11 novels of this series.
