 His first novel, "Detta är verkligheten" ("This is reality"), was awarded at the Paneuropean convention in Trieste in 1972, and has been translated into Danish and Czech.He also published a series of science fiction, science fantasy and fantasy novels, and published science fiction stories in English, German, French, Danish, Spanish, and Italian.Mårtensson also wrote four police procedural crime novels in the late 1970s, the second of which was awarded the Sherlock Award for best Swedish crime novel of 1977.