Pretty Little Liars is about a group of five beautiful girls play together: Spencer, Aria, Hanna, Emily and Alison. On a rainy night, they share intimate secrets with each other, but then Alison, also at that night, had strangely disappeared. More strange when one year later, each of four girls received threatening messages from someone who signed as "A", a person who knows all about them. Abruptly, the secrets, from the smallest to the biggest thing, even the most secret things do not seem to be a secret anymore.