Family and friends talk about life in Sydney's Northern Beaches.

As Chris brazenly moved his teenage lover into the family home, Lyn saw the cracks in her marriage widen. It was crumbling all around her. Unable to believe the worst of her husband, she responded with denial, but to her family and friends Lyn's suffering was clear. And the toll was not just emotional. In this episode, a former babysitter for the Dawsons speaks for the first time about the violence she witnessed in the home.

<p>As Chris brazenly moved his teenage lover into the family home, Lyn saw the cracks in her marriage widen. It was crumbling all around her. Unable to believe the worst of her husband, she responded with denial, but to her family and friends Lyn's suffering was clear. And the toll was not just emotional. In this episode, a former babysitter for the Dawsons speaks for the first time about the violence she witnessed in the home.</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.

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