Brian Johnson 
Secret War [PDF ebook] 

A look at the scientists and technicians whose hard work off the battlefield assisted the Allied Forces in winning the World War II. Based on the BBC television documentary series of the same name, this book offers a behind-the-scenes look at the fight by the ’;back room’ scientists and technicians of the Second World War, including the battles against the Luftwaffe navigational beams, the V-1 and V-2 flying bombs, the development of radar, the battle against the U-boats, countering the magnetic mine, and the breaking of the codes produced by the Enigma machines.