This is the story of the daring reconnaissance pilots who took aerial photographs over Occupied Europe during the most dangerous days of World War II, and of the photo interpreters who invented a completely new science to analyze those pictures. They were inventive and ingenious; they pioneered the development of 3-D photography and their work provided vital intelligence throughout the war.

Secret missions -- Sid Cotton's Air Force -- Crisis -- Medmenham -- The mad men of Ham -- Boffins at war -- A rare form of bravery -- The "Warby" legend -- Finding the targets -- Assessing the damage -- To the Mediterranean and India -- Arguments with Allies -- Planning for Overlord -- Special operations -- Hunting the Vengeance weapons -- Towards victory -- "80 per cent of all intelligence"? -- Epilogue.