Sara Shepard 
Pretty Little Liars #15: Toxic 

#1 New York Times bestselling series The fifteenth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars.High school seniors Aria, Emily, Spencer, and Hanna barely survived their most recent encounter with A. And it’s not over yet . . . The police don’t believe that the real A is still out there, but the girls know whatand whothey saw. If they don’t track down this final tormentor soon, A will silence them forever.Full of unexpected twists and shocking revelations, Toxic is the penultimate book in New York Times bestselling author Sara Shepards compelling Pretty Little Liars series.