A series of brutal rapes 40 years ago on Australia’s Gold Coast was never solved but as one of the victims recalls a vital clue Tara and Mark investigate.

Are the unsolved Gold Coast attacks connected to a violent attack and shocking triple murder which took place years later in Melbourne?

The Balaclava killer's MO escalates. Could convicted triple murderer Ashley Coulston be the perpetrator?

Digging into Coulston’s childhood reveals a shocking crime from his past.

The tragic repercussions of the Balaclava attacks run deep and another unsolved murder on the Gold Coast raises questions.

A series of unsolved missing persons cases lead to a hunt for lost forensic evidence. The Balaclava attacks stop suddenly.

A series of violent rapes in the Sutherland area of Sydney bear a striking similarity to the Balaclava attacks just as Coulston is living nearby. There’s a possible break-through in the Sutherland case and more disturbing evidence of an incident from Coulston’s past.

Ashley Coulston makes friends in Sydney and plans a boat trip to New Zealand but the Sutherland attacks continue. Coulston’s stalking escalates.