Separating myth from reality, The Enemy Within traces the history of espionage from its development in ancient times through to the end of the Cold War and beyond.

This detailed account delves into the murky depths of the realm of spymasters and their spies, revealing many amazing and often bizarre stories along the way, shedding light on the clandestine activities that have so often tipped the balance in times of war.

From the monkey hanged as a spy during the Napoleonic wars to the British Double Cross Committee in World War II, this journey through the history of espionage shows us that no two spies are alike and their fascinating stories are fraught with danger and intrigue.