The series exploring Britain's criminal underworld returns, beginning with profiles of Liverpool-based gangsters Stephen 'the Devil' French and Boris Boszomenyi.

An insight into the crimes of the Peaky Blinders, the Birmingham-based gang that eventually forged ties with the Krays as part of the flourishing gang culture of the 1960s.

An insight into how the cessation of open hostilities between Unionist and Nationalists factions in Northern Ireland led to an underground war between militant groups.

Focusing on renowned villains Eddie and Billy Blundell, this episode also delves into the murky world of rave culture.

Bernard O'Mahoney explores the injustices suffered by those who have somewhat unwittingly surrounded themselves by criminals, including Phil Berriman.

Bernard O'Mahoney explores the injustices suffered by those who have unintentionally surrounded themselves with criminals.

Bernard O'Mahoney looks at the effect of time on gangs and their origins, from bikers to Irish travellers, as their roots are dying out with every new generation.

In the final episode of the series, Bernard O'Mahoney explores the minefield that is the media and how its influence has been used to build celebrities out of men, without checking facts. Is it possible to create a gangland persona based purely on a false reputation built by the press? Yes, but there are certain to be extremely costly consequences