David Cunningham has long believed his sister Anita and her travelling companion Robin Hoinville Bartram were victims of serial killer Ivan Milat. But new evidence suggests Milat was in New Zealand when the pair disappeared. In a deeply personal interview, David reflects on his lifelong search for answers as Adam examines fresh evidence placing Whiskey Au Go Go bomber John Andrew Stuart in the area and asks whether police have been fully transparent about one of Australia's enduring missing persons mysteries.

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