Based on a book, Pretty Little Liars follows four best friends (Spencer, Hanna, Aria & Emily) whose clique falls apart after the disappearance of their queen bee, Alison. Three years later, estranged friends reunite when they begin receiving messages from someone using the name "A" who threatens to expose their secrets - including long-hidden ones they thought only Alison knew.
Series Fun Facts
- Sasha Pieterse, who plays Alison DiLaurentis, was only 12 years old when shooting the pilot.
- In the book series, Alison's disappearance takes place the summer before the girls went into 8th grade, 3 years prior to the series beginning. In the T.V. show it only takes place 1 year earlier.
- Jean Louisa Kelly was originally cast as Ella, but before the pilot was replaced by Holly Marie Combs.