Ross Kemp starts his journey under Blackfriars Bridge - the location of Britain's first mafia hit - before following the money trail across the UK
Ross Kemp heads to New York, discovering the connection between USA and Britain in the rise of the mafia - before learning about the infamous Krays.
Ross sees just how prevalent cocaine is in Colombia on an army raid, before meeting the son of Gilberto Rodriguez - a founder of the Cali Cartel.
When a century-old extradition treaty between Britain and Spain ended in 1978, the Spanish Coast became a safe haven for criminal masterminds.
Visiting a village in Calabria, Ross discovers the true extent of the mafia's powers - before meeting the daughter of an Italian mob boss.