Sidney ReillyA revealing biography of Sidney Reilly, the early twentieth century virtuoso of espionage Sidney Reilly (c. 18731925) is one of the most colorful and bestknown spies of the twentieth century. Emerging from humble beginnings in southern Russia, Reilly was an inventive multilingual businessman and conman who enjoyed espionage as a sideline. By the early twentieth century he was working as an agent for Scotland Yard, spying on migr communities in Paris