Supposedly safe in witness protection, Andrew Petrelis, the star witness in a $40 million dollar drug importation is instead found dead just before he's due to give his testimony. His death is deemed a tragic drug overdose, but Liz Hayes and her team of experts tear that theory apart.

Dawn breaks in the blissful Tasmanian coastal town of St. Helens, and the body of 15-year-old Eden Westbrook is found hanging from a tree in a public park. Liz Hayes and the Under Investigation panel discover serious flaws in the police investigation, with new witnesses painting a terrifying scenario of what befell this vivacious teen that night.