This 1939 case seemed ripped from the pages of a detective novel — and may even have been inspired by one. There was the man with the murky past. Sisters who met sudden suspicious deaths. A corpse that had to be exhumed. Crucial evidence that was allowed to be destroyed and a coroner with a bizarre conflict of interest. Adding to the sensation: police thought by solving the Walwa mystery, they might also solve Australia’s most famous unsolved murder — that of the Pyjama Girl.