Warning: This episode contains descriptions of sexual assault, child sexual abuse, drug use, torture and mutilation. The murders in Adelaide didn’t stop with Alan Barnes and Neil Muir. Two more boys - 14 year old Peter Stogneff and 18 year old Mark Langley — would vanish under eerily familiar circumstances. As the investigation unfolds, it starts to become alarmingly clear; these crimes weren’t committed by a sole perpetrator and they aren’t slowing down. Whoever these people were, they held a chilling confidence in committing such heinous crimes.