In 1960, 8-year-old Australian boy Graeme Thorne was abducted and murdered.
His kidnapper demanded a ransom of part of the money that his parents, Bazil Thorne and Freda Thorne, had won in an Opera House lottery.
The crime, regarded as one of the most infamous in Australia's history, caused massive shock at the time and attracted huge publicity, and was the country's first known kidnapping for ransom.
The police investigation that led to the capture and conviction of his murderer, an immigrant named Stephen Bradley, is often considered as sophisticated, pioneering, and the start of modern forensic investigation in Australia.