The novel deals with 4 girls in high school who had been best friends at one point but drifted apart after the leader of their clique, Alison DiLaurentis, disappears the night of one of their sleepovers.
The novel deals with 4 girls in high school who live in the exclusive town of Rosewood, Pennsylvania. They were best friends but drifted apart after the leader of their clique, Alison DiLaurentis, the "it" girl of Rosewood disappeared the night of one of their sleepovers.