Aurora

Most people who speak about military secrecy are kooks who believe that the government is in cahoots with "the Visitors." But Bill Sweetman isn't one of them. His "Aurora: The Pentagon's Secret Hypersonic Spyplane" examines the best available evidence and draws a logical conclusion: the military has at least one high-speed aircraft.

Sweetman overviews operations at Groom Lake from the U-2 to the A-12 to the Have Blue and F-117. He also looks back at most major hypersonic research programs that were carried out over the years. From there he talks about air-breathing rockets and arrives at the general shape of the aircraft known as Aurora.