Leonard Gribble was born in 1908 in Barnstaple, Devon, England. He was a prolific author who wrote under several pseudonyms. He served in the Press and Censorship Division of the Ministry of Information in London from 1940-45. He was a founding member of the Crime Writers Association in 1953, and also wrote Westerns (under the name Landon Grant) and books on nonfiction subjects such as criminology, as well as producing compilations and editorial works.