In 2003, Pat Tillman, serving in the US Army, hastily wrote a "just in case" letter to his wife, Marie. When he returned on leave before his departure to Afghanistan, he placed the letter on top of their bedroom dresser. For months it sat there, sealed and ever-present, like a black hole through which Marie knew her stable life would be pulled if she ever had reason to open it. Then, in April 2004, Marie's worst nightmare came true. In the days following his death, it was Pat's letter that kept her going.