The Secret In Harley Street
Written by
Gilbert Frankau
Copyright 1933
Story 1 of 7 in The Seven Secrets of Marcus Orlando series, published in The Story-teller, December 1933. Reprinted as part of the anthology A Century of Spy Stories edited by Dennis Wheatley, 1938. Reprinted in , a collection of espionage stories by Frankau, 1934.
A British Bolshevik agitator recently returning to the UK with a new plan to bring down the existing government makes the mistake of needling Marcus Orlando who, already planning to stop him, now has extra incentive.
Marcus Orlando is exercising his new horse around a London park when he spots an infamous agent for the Soviet Union attending a Bolshevik rally. Orlando knows the man, a former British physician struck down from practicing, is in the country for no good reason and Orlando wants to know what that is.