The Widows of Broome - Arthur W. Upfield

Broome is a little sun-drenched town on the barren north-west coast of Australia, the kind of place where everyone knows everyone else's business, where all the little bungalows might be glass for all the secrets they hide. How then had the murderer of Broome's two most attractive widows got away without leaving a single clue? Detective-Inspector Bonaparte investigates, with his usual calm precision - but the murderer strikes again, and Bony realises he is dealing with a madman - that time is running out...

'Bony - a unique figure among top-flight detectives' - BBC