Although he is considered one of the greatest spies of the last century, whose actions were decisive in the Allied victory over Nazism and whose flawless organization is said to have influenced the creation of the CIA, William Stephenson remains largely unknown to the general public. Fueled by revelations from British intelligence archives recently made public, this historical documentary fully restores the light on this shadowy man who, after his exploits, quietly returned to the anonymity of a successful businessman, until his death in 1989.