When and entire family of six and two visiting guests are wiped out by an axe-wielding killer, a small Iowa town spirals into chaos and division. American's greatest unsolved mystery built and ruined polical careers, created a lasting community split over the guilt or innocence of a local State Senator, and produced a series of litigations culminating in three sensational trials. Was the Villisca crime the work of a serial killer who committed similar homicides in Colorado, Kansas, and Illinois? Rare photos, limited reenactments, compter animation, and fascinating interviews with eye-witnesses, historians, town residents, and forensic experts shed light on the still-unsolved mystery and dramatically reveal the face of a new suspect.