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In his new BBC series, the ex-professional footballer speaks to young men involved in criminality, from favelas in Brazil to gangs in Sweden.

Mr Cain said the Brazilian favelas were the scariest place he visited but added: "It was also the most fantastic and phenomenal place, I dreamed of going there since I was a kid".

“If you listen carefully to the entire album, you will see that we have the Russian mafia, the Italians, the Brazilians in the favelas — it’s like the sonic DNA of the entire planet.”

Football had been his escape from the favelas of Brazil's Porto Alegre, but now it felt like a dead end.

It was at that point, when he was at rock bottom, that a well-known drug dealer in the favela summoned him.