A book for all those that have read about Bletchley park and the enigma code breaking.This details an unsung part of the intelligence gathering of WW2, the collection of aerial photography. The book covers the use of cameras in planes in WW1 and follows through to the buildup to the war in 1939, and into the war. The pilots of these aircraft flew high, fast and unarmed and were some of the bravest pilots in the airforce.The assessment side of the operation was streets ahead of the Americans as well, but by the end of the war they had 'borrowed' most of the techniques for their own use.Well worth a read.