Some of the UK's most notorious hitmen, capos, and bosses have lived in caravan parks, shoe shops, semi-detached houses, and coffee shops. An intricate path reveals the true reality of Britain's historical relationship with the mob as Ross Kemp follows a trail of illegal money and drugs around the world. During prohibition, the British exported alcohol that contributed to the establishment of the mafia. Ross learns about the relationship between the five families and the notorious Kray Twins and gambling in the 1960s; and the fall of the US mob to RICO and its impact on Colombian drug cartels.