Unmercifully badgered, bullied and teased throughout her high school years, Sarah Vincent toils twenty years preparing for her 20th Reunion. Much of her planning involves weight loss, muscle gain, survival techniques, mastering the art of dart throwing and bizarre, but creative methods for brutal, pay-back style assassination. Sarah sets out to terrorize and torture her old antagonists in a way only they could appreciate. Skagit Sheriff's Deputy Jesse Crater becomes embroiled in the series of murders when it becomes clear his wife, Sally, also graduated with Sarah Vincent and could easily be on her radar of likely targets.