In picture-perfect Rosewood, Pennsylvania, pictures often lie—and so do Rosewood's four prettiest girls.

Hanna's on a mission to corrupt Rosewood's youth, starting with a very attractive sophomore. Aria's snooping into her boyfriend's past. Spencer's stealing from her family. And pure little Emily's abstaining from abstinence.

The girls should be careful, though. They thought they were safe when Ali's killer was arrested and A's true identity was finally revealed. But now there's a new A in town turning up the heat. And this time Rosewood is going to burn.