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, as well as learning about the infamous Kray twins.

Ross sees just how prevalent cocaine is in Colombia as he joins 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 the mafia and 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.