Toxic: A Pretty Little Liars Novel

Toxic is the fifteenth book in Sara Shepard's Pretty Little Liars series, featuring high school seniors Aria, Emily, Spencer, and Hanna as they continue to face their tormentor known as A. The girls barely survived their most recent encounter with A and know the real A is still out there, even though police do not believe them. They must track down this final tormentor before A silences them forever.