Valkyrie is an historical thriller about Nazi officer Claus von Stauffenberg and his failed attempt to assassinate Hitler toward the end of WW2.
The challenge with historical movies is that the audience already knows the outcome. One way to overcome this is to add a love story, like Titanic. You have to give the audience something. Valkyrie gives us two things: suspense and Tom Cruise.
I am no expert on this period, but I had heard about the Stauffenberg plot and the movie seemed pretty faithful to history. I was also on the edge of my seat through most of it. Tom Cruise does a great job, especially toward the end as the wheels come off.