New evidence on Truman's decision.

Investigates the role of U.S. President Harry Truman in the use of atomic bombs on Japanese cities at the end of World War II. Discovery of President Truman's Potsdam diary and letters; Evidence that Truman might have had more to do with the bombing of Hiroshima and Nagasaki than the president ever publicly admitted; Specific military justification regarding the use of atomic bombs; Basic elements of the debate over the bomb decision.