Paul Dibb tells The Australian's Associate Editor Cameron Stewart why he's bitter about his former ASIO bosses.

Only a small section of our interview with Jay Hart made it into episode 5. Here is the full 45 minute conversation. A podcast investigation into a case that remains unsolved after 25 years.

How strong is the evidence of Jay Hart's innocence? Can you build a case to prove he didn't do it? A podcast investigation into a case that remains unsolved after 25 years.

How the courts refused to jail the main suspect in the murders. Has a serial killer been allowed to walk free? A podcast investigation into a case that remains unsolved after 25 years.

Who is Jay Hart? His family and former friends describe the boy who grew up to be the suspect in the case. A podcast investigation into a serial killing that remains unsolved after 25 years.

What happened after the police finally arrived in Bowraville? The mistakes made - and the evidence never heard in court. A podcast investigation into a serial killing that remains unsolved after 25 years.

Three children disappear from one small Australian town; the same man seen at the scene of each, but never convicted. A podcast investigation into a serial killing that remains unsolved after 25 years.

Controversial and outspoken agribusiness executive David Williams holds court at The Australian's 2016 Global Food Forum, discussing Chinese investment, and the misplaced focus on Australia's north.