Tricycle was the codename of both Dusko Popov (Душко Попов), and the network with which he was involved. Popov was despatched to the United States by the Abwehr to gather information. Popov made contact with the FBI and explained what he had been asked to do. One of the items on their list was information about Pearl Harbor.
Fleming worked in British naval intelligence during World War II and was detailed to trail the charismatic spy, who was eventually recruited to work as a double agent for the British.
Popov was known for his irresistible charm and his superb work as a spy.
Dusko Popov published his memoirs "Spy, Counterspy" in 1974. Popov died in 1981.
A wealthy playboy, incorrigible womaniser and dedicated gambler, DuskoPopov was one of Germany's most trusted spies, one of Britain's most successful double agents, and, some say, the inspiration for James Bond.
Throughout the war he fed the Germans with a constant stream of military 'intelligence', all vetted by MI5, and came to be viewed as their most important and reliable agent in Britain.
After the war DuskoPopov was granted British citizenship and awarded an OBE.
Popov differed from his fellow spies in that he lived a life of luxury, drove fast cars, seduced beautiful women and bankrupted Germans - especially spies, diplomats and PIDE "advisors" - at the Estoril Casino.
During the war, Popov was considered to be one of the most important British agents operating in the nest of spies in Portugal.
Popov travelled in person to the United States with a stack of documents in his briefcase, which he took to the New York office of the then director of the Federal Bureau of Investigations, J. Edgar Hoover.