Reilly, Ace of Spies is a 1983 British television programme dramatizing the life of Sidney Reilly, a Russian-born adventurer who became one of the greatest spies ever to work for the United Kingdom and the British Empire. Among his exploits, in the early 20th century, were the infiltration of the German General Staff in 1917 and a near-overthrow of the Bolsheviks in 1918. His reputation with women was as legendary as his genius for espionage.