Disappearance of the Beaumont children

Jane Nartare Beaumont (born 10 September 1956), Arnna Kathleen Beaumont (born 11 November 1958) and Grant Ellis Beaumont (born 12 July 1961), collectively referred to as the Beaumont children, were three Australian siblings who disappeared from Glenelg Beach near Adelaide, South Australia, on 26 January 1966 (Australia Day) in an unsolved disappearance case and a suspected abduction and murder. Police investigations revealed that, on the day of their disappearance, several witnesses had seen the three children on and near Glenelg Beach in the company of a tall man with fairish to light-brown hair and a thin face with a sun-tanned complexion and medium build, in his mid-thirties.

Source: Wikipedia — Disappearance of the Beaumont children (CC BY-SA 4.0)