Before there was A, there was Alison DiLaurentis. Boys wanted to date her, girls wanted to be her, and somebody wanted her dead. It's the end of seventh grade, and Alison DiLaurentis and her friends are the girls of Rosewood Day. Ali runs her clique with an iron fist, and she's got enough dirt on Hanna, Emily, Aria, and Spencer to keep them in line. But Ali's hiding a dark secret of her own, something so huge it would destroy everything if it ever got out. She's desperate to keep the perfect life she's worked so hard to build, but in Rosewood deadly secrets have deadly consequences.
In Rosewood, Pennsylvania, four stunningly beautiful girls are haunted by a very ugly past. Spencer, Aria, Hanna, and Emily want nothing more than to forget Alison DiLaurentis, their former best friend who tried to ruin their lives. But someone refuses to let her memory die. A is still out there, lurking in the shadows and digging up the pretty little liars' newest secrets. Emily's reconnecting with an old flame, one baby step at a time. But is she headed toward true love or another bundle of heartache? Spencer's learning about the highs and lows of campus life on a trip to Princeton.