Sir Robert Hamilton Bruce Lockhart, KCMG was a British diplomat, journalist, author, and secret agent. His 1932 book Memoirs of a British Agent became an international bestseller by telling of his experiences in Russia in 1918 following the Bolshevik Revolution. He left the country after he was accused of having led a failed plot to assassinate Vladimir Lenin, the so-called Ambassadors' plot, a charge which he always denied. No. 1 on The New York Times Nonfiction best seller list for 2 weeks, from the issue of April 10, 1933. Wiki link