On 12 January 1965 the bodies of Marianne Schmidt and Christine Sharrock, both 15 years old, were found in the sand dunes at Wanda Beach, near Cronulla, in Sydney. They had been brutally murdered the previous day. Within 18 months police interviewed 7,000 people, making it the largest investigation in Australian history.
Countless theories and leads have been proposed since then. As recently as 2018 a new suspect has been identified, Christopher Bernard Wilder, who immigrated to the United States in 1969 and became known as 'The Beauty Queen Killer'. But despite all the theories, the 'Wanda Beach Murders' remains one of the most famous unsolved Australian murder cases of the 1960s.