on the novel, in the magazine Boy's Life (), November 1968 – March 1969. References Further reading John Dickson Carr, The Man Who Explained Miracles, by Douglas G. Greene, New York, 1995 Encyclopedia of Mystery and Detection, by Chris Steinbrunner and Otto Penzler, New York, 1976, "Spielberg Spying Matt Helm: Secret Agent May Be Subject of Director's Next Film", by Michael Fleming, Variety, Wed., Jul. 29, 2009 External links Article on the history of the Matt Helm films: "Mr Helm Goes to Hollywood," November 14, 2011. Cinema Retro. Helm, Matt Novel series Helm, Matt American film series