The years leading to World War 2 saw unprecedented espionage activity ...
Every nation was developing secret technologies ...
... guarding the secrets it had learned in the prior war.
... and preparing for the looming next one.
All of Europe was on edge and jockeying for advantage.
Advantages that could only be gained through the careful use of spies.
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"It is essential to seek out enemy agents who have come to conduct espionage against you and to bribe them to serve you. Give them instructions and care for them. Thus doubled agents are recruited and used."
-- Sun Tzu