Found - a rare and sensational Australian pulp mystery/ thriller from the late 1940s. Unknown to online malls and the great bibliography of crime fiction by Allen J Hubin, although he lists other titles by Max Afford. It is titled An Ear for Murder (Frank Johnson, Sydney, no date). The inside cover reads:
This is a Magpie novel - read it now it will hold you to the end.
What manner of creature was this, to whom the slaying of his victim was not enough? What manner of foul beast was it whose bloody fingers must perform the further savagery of mutilation? What strange secrets lay behind the locked doors of the mysterious, corpse-guarded study? These are the questions answered by world-famous criminologist Jeffery Blackburn in this punch-packed story of murder on the loose. With thrills on every page, this grand story of crime and detection is a "must" for murder-fiction fans. You won't be able to put it down until you've turned the last page.
The book appears intelligent and well written , the sleuth's day job being a professor of higher mathematics. The claim on the cover 'No crime could be more horrifying in its ferocity' may be something of an exaggeration..the plot involves a crazed novelist, a millenarian sect and a titled British millionaire stockbroker. There are as many as 100 books in the Magpie series, not all thrillers or even fiction.