The Canaris Conspiracy: The Secret Resistance to Hitler in the German Army

July 20, 1944. Colonel Claus von Stauffenberg carried a time bomb in a briefcase into a conference with Adolf Hitler. After wedging the briefcase directly in front of Hitler under a table, Stauffenberg took his leave. Only ill luck and divine providence could have caused what happened next; a junior staffer accidentally kicked the case, moving it further from Hitler. When the bomb exploded, four died, but none was the megalomaniacal Führer.

Men from all walks of German life—the army, Milit...