Near the end of World War II, as the Nazi Germany regime begins to collapse, a mysterious vigilante begins hunting down German officers and soldiers responsible for atrocities that may otherwise go unpunished.
Two German investigators, Inspectors Tannhauser and Volz, are assigned to track down the killer known only as the Iron Ghost. Their only clue is a torn piece of paper bearing a single word. As they investigate, they uncover a web of suspicion, betrayal, and hidden identities—forcing them to consider that the Iron Ghost could be anyone, even someone within their own ranks.
