Albert Packer is the supreme baron of London crime, ruling his domain with a ruthless fist and thinking of himself as the Untouchable.

As yet another criminal case against him collapses, Packer turns his attention to expanding his heroin empire abroad, deciding to travel to Sarajevo himself in order to cut out the middle man.

But the Customs & Excise unit tasked with taking him down are determined not to give up. Packer may be king on his home turf, but on the war-torn streets of a city where justice is enforced by gangster warlords, he might just make a mistake. And Joey Cann, obsessed with bringing Packer to justice, will be there when he does.