Mark "Hammer" Dixon spent years on the road with Roger Rogerson and Mark "Chopper" Reed — working security, collecting debts and sharing hotel rooms in outback Queensland. And in that time, Rogerson said things he probably shouldn't have.

He told Dixon the two men convicted of the 1973 Whiskey Au Go Go firebombing — which killed 15 people — were innocent. That he'd written them up. He hinted that Donald McKay's body was never going to be found in Griffith, because investigators were looking in the wrong state. He let slip, in an unguarded moment over a glass of red, exactly who pulled the trigger on undercover cop Michael Drury in 1984.

Dixon isn't a criminal. He has no record. But for a stretch of years, he had a front-row seat to one of the most dangerous men Australia has ever produced — and he remembers everything.