Pretty entertaining, even if in every story Flandry's first move upon landing on a new world and meeting with the local authorities, is to shoot out a window and run for it. You'd think his visits were being sponsored by the local glaziers.

Three novellas The Game of Glory, A Message in Secret and A Plague of Masters. Captain Sir. Domenic Flandry. Interplanetary James Bond. (created a full two years before the first James Bond was written). A Plague of Masters is Earthman, Go Home printed by Ace in 1960.