 The title refers to criminal Rafael Delgado, an expert diamond thief. He s involved with a band of criminals, who dress in British style (bowler hats and umbrellas) but who speak Italian. It s implied they are Mafia types trying to pass themselves off as British. Delgado, even while in prison, has pulled off a stunning robbery with the help of the gang. So many diamonds are missing it could affect the world s economy.