Summary: Meet the Pretty Little Liars. There’s Aria Montgomery, Spencer Hastings, Hanna Marin and Emily Fields. When their best friend Alison DiLaurentis goes missing, they all grow apart. The girls begin receiving text messages from a person known as ‘A’ who is planning to reveal all their secrets which only Alison knows. They quickly begin to suspect Alison is the one behind the text messages but they might have the wrong person. Note: This episode is based on the entire first Pretty Little Liars novel. This episode was shown three times on ABC Family. You can get the episode for free on iTunes by going to the show’s “store”. Ed: The first episode covers only the basic information learned in the first few chapters of the first book that create the basis for all of the first four books however an entire book was not covered in one episode.