The 32-year-old once served as a background figure in the Gucci Gang, one of Dublin's most prolific organised crime collectives. The ever-changing and often fatal landscape of gangland activity meant that Salmon eventually emerged as the unlikely leader of that group - a leader who built a reputation for violent intimidation in the pursuit of drug debt.
If you're familiar with the prolific British writer's fondness for grimy historical dramas embellished with as much street brawling as possible, you may be able to envision the tone. The Netflix drama launches into its tale by cutting between preparations for the funeral of Sir Benjamin Lee Guinness, much-beloved patriarch of the famous Irish brewery, and a demonstration outside its gates against the dangers of inebriation.