He was brave enough to stand up to the mafia in a country town. But Don Mackay paid the ultimate price. His enemies weren't just mafia living by the creed: You speak, you die. He was also facing a political insider.

When one of Australia's most senior police officers was killed in his own driveway they suspected a professional hit. Investigators jailed and then freed another man. So who killed Colin Winchester? Was it the mafia?