Although WW2 was a punishing experience for the British people, there is no denying that it was also one of the most intellectually stimulating periods in the nation's history. Engineers and designers had to produce ner generations of weapons to short order. The armed services faced the challenges of fighting in wildly different terrains and climates, from the arctic conditions of Norway to the tropical jungles of Burma.. The British government performed a comprehensive re-engineering of society at every level, from the evacuatiom of children to the conscription of millions of soldiers. Such efforts were the visible face of Britain's war. Yet numerous other battles - some with equally high stales - were fought in sercret, away from the eyes of the public. Most were part of the intelligence war, the covert struggle to obtain enemy military and political secrets, while at the same time protecting confidential British information from foreign spies...