Albert William Packer is the supreme baron of London crime. He rules his manor with a cruel, ruthless fist. To those around him, on whatever side of the law, he is the Untouchable.
Another case against him in tatters, Packer walks free from the Old Bailey. Yet again he and his solicitor have outsmarted the Customs & Excise unit tasked to take him down. Now bored with his own success, Packer sets out to expand his empire abroad. His core business is heroin, bought from the Turks in North London's Green Lanes. Where better to cut out the middleman than at the historic smuggling crossroads of Europe, the Balkans?
New men and women are drafted into Custom House dedicated to convicting Packer. Only one member of the old team survives: the most junior, Joey Cann, retained solely for his obsessional knowledge of the man who calls himself "Mister". When Packer leaves for Sarajevo, it is inevitable that Cann be sent after him for "intrusive surveillance". The brief: to bring back the evidence that will finally nail Packer to the wall.
In London, it would have been no contest. But here on the war-torn, dismal streets of a city where justice is enforced by gangster warlords, Packer is far from home and from what he knows. Here, who will be the Untouchable? Who will walk away?