While the papers of the time relegated Rose Mackenberg to a sidekick role as the "girl detective" working with famed skeptic and escape artist Harry Houdini, this spiritualist-turned-spook-spy spent decades busting con artists purporting to be mediums. And, after Houdini's death in 1926, Rose Mackenberg continued her mission, exposing fraudulent ghost racketeers -- a genuine, real-life ghostbuster.