The Footprints of Satan
Berrow was a New Zealander, though none of his novels is set there.  He was married, spent some time in Gibraltar in the 30s (his early books are set there and he seems to have known the place pretty well), and was in the military service for six years during and just after World War II. He wrote 20 novels between 1936 and 1954, all of which are published by Ramble House.