Operation Valkyrie is a famous plan of the German Resistance to overthrow the tyrannical Nazi government.
Standartenfuhrer Gerhard Mayer, a patriot who works in Reich Security Head Office learns that Gestapo has tracked down the conspirators. He does everything possible to make the investigation assigned to him and tries to mislead Gestapo in order to help the Resistance to overthrow the Nazi regime and stop the war.