S1, E1: Derek Percy was imprisoned for the murder of 12-year-old Yvonne Elizabeth Tuohy, after abducting her from a Victorian beach in July 1969. He initially tried to abduct Yvonne and her friend, Shane Spiller, but Shane managed to run away and hide. Percy was eventually tracked down at a nearby naval base, and after being interviewed, showed officers where he had dumped Yvonne’s body. Percy was found not guilty through reason of insanity and detained at her Majesty’s pleasure. After spending over 40 years in prison, he died in July 2013 from lung cancer, refusing to answer any questions in relation to the disappearance of many other children in Victoria. Much debate surrounds the disappearance of the Beaumont children, who disappeared while playing on Glenelg beach, Adelaide in 1966. The two sisters and their brother have never been seen since. Percy has often been suspected of their murder. He is also suspected of the brutal murders of Allen Redston, Linda Stilwell, Simon Brook, and the Wanda beach murders where two teenage friends were stabbed to death.