Very few people have heard of Detective Sergeant Dion Achtypis - but there may well be no more important investigator in Australia.

You won’t see him holding a press conference at a murder scene or commanding a squad of detectives. And he doesn’t use a sledgehammer during raids - he gains access in a much more subtle way. He is part of a three-person team working in the present while exploring the future.

Cyber cop Dion Achtypis sits down with John Silvester to discuss Bitcoin, international crime syndicates and the Underbelly series.