#1 New York Times bestselling seriesThe first book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars.In ultra-trendy Rosewood, Pennsylvania, four beautiful girls are hiding very ugly secrets. High school juniors Spencer, Hanna, Aria, and Emily have grown apart since their best friend Alison DiLaurentis went missing three years ago. But now someone is sending them anonymous notes, threatening to reveal their darkest secrets. There's only one person who knows that much about them, but Ali's gone . . . isn't she?Full of unexpected twists and shocking revelations, this is the first book in New York Times bestselling author Sara Shepard's compelling Pretty Little Liars series.