Police ramp up investigations into the case.

Chris Dawson was interviewed by police in 1991, and then never again. But Sue Strath, Lyn's loyal friend, kept agitating for a further investigation, and in 1998 Detective Damian Loone was assigned to the case. Curiously, the earlier investigation notes had vanished.

<p>Chris Dawson was interviewed by police in 1991, and then never again. But Sue Strath, Lyn's loyal friend, kept agitating for a further investigation, and in 1998 Detective Damian Loone was assigned to the case. Curiously, the earlier investigation notes had vanished.</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.