Richard Gordon 
Invisible Victory 

Jim Elgar is a young chemist struggling to find work in nineteen-thirties’ Britain. He moves instead to the scientific world in Germany and finds himself perfectly placed to undertake top-secret work for the British war effort. His ensuing role in counter-espionage takes him on a high-speed spy-chase through Europe, only just ahead of the invading Nazis. The Invisible Victory is the story of cut-throat medical research and life-saving discoveries in the face of wide-scale suffering and death.