Walkyrie, (the movie made in 2008 by Bryan Singer, with Tom Cruise as Claus Schenk Graf von Stauffenberg) is, I think, very well made. It respects in the most accurate way the facts, it keeps away from any attempt to romanticize whatever, and it has the perfect pace, like real time.
What would have followed were the plot to succeed? Would have been the end of the war then, in July 1944? I'm not sure. The engagement had been total, the only logic of the war had been succeed or disappear, so the Allies were committed to punish Germany, with or without Hitler. Unconditional surrender was the only option.