This year marks the 40th anniversary of the Tynong North and Frankston murders. Still to this day, the case remains unsolved. Despite a long-running investigation by the country's top detectives and a massive reward offered by Victoria Police, the identity of Australia's third-worst serial killer is unknown. In this episode, reporters Jake Pike and Charisa Bossinakis delve into the murders of the six women, speaking to the people whose lives are still touched by the ripples of their deaths. They also speak with Walkley-winning journalist John Silvester, an original reporter on the case.