Theories abound as to where Lyn might be.

In the days and months following Lyn's disappearance, Chris Dawson put forth a range of suggestions as to her possible whereabouts. Perhaps she had gone north to think about their marriage. Maybe she'd joined a cult, or a religious group. But whatever he said, he clearly believed she was never going to return, as he promptly moved JC back into the family home where she became the new mother to his two children. 

<p>In the days and months following Lyn's disappearance, Chris Dawson put forth a range of suggestions as to her possible whereabouts. Perhaps she had gone north to think about their marriage. Maybe she'd joined a cult, or a religious group. But whatever he said, he clearly believed she was never going to return, as he promptly moved JC back into the family home where she became the new mother to his two children. </p>

The Australian's Hedley Thomas digs deep into a cold case which has been unsolved for 36 years, uncovering startling new evidence.

Lyn and Chris Dawson appear to have the perfect marriage. He's a star footballer and popular high school teacher. She's a devoted wife and mother. They share a beautiful home above Sydney's northern beaches. But when Lyn goes missing, dark secrets are buried. This is no fairytale, but a sordid story of strangely close twin brothers, teenage student lovers, and probable murder. The Australian's Hedley Thomas digs deep into a cold case which has been unsolved for 36 years, uncovering startling new evidence.