Fan Casting Pretty Little Liars

The series is loosely divided into four arcs of four books each, chronicling the introduction and reveal of each "A". The series follows the lives of four teenage girls;— Aria Montgomery, Emily Fields, Hanna Marin, and Spencer Hastings— whose clique falls apart after the disappearance of their leader, Alison DiLaurentis. Three years later, they begin receiving text messages from an anonymous source, "A," who threatens to expose their secrets— including long-hidden ones they thought only their close friend Alison knew. But shortly after, Alison's body was discovered. The first arc covers Mona Vanderwaal's reign as "A" and the second arc focuses on solving the mystery of Alison DiLaurentis' murder, as well as Alison DiLaurentis' run as "A". The third and current arcs feature an "A" whose identity is currently Nick Maxwell who is helper A and all the girls knew him as someone else. There are two companion novels: the first, Pretty Little Secrets, is set between the first and second arcs. The second companion novel, Ali's Pretty Little Lies, is a prequel to the series. The four girls are nicknamed the Pretty Little Liars or simply the Liars.