When an American sailor from the Holy Loch Base goes missing, Harry McCoy is determined to find him. But as he investigates, a wave of bombings hits Glasgow. Soon McCoy realises that the sailor may be part of a shadowy organization led by a dangerous fanatic and committed to a very different kind of Scotland. A Scotland its members are prepared to kill for.

Meanwhile Cooper, McCoy's long-time criminal friend, is released from jail and is convinced he has a traitor in his midst. As allies become enemies, Cooper has to fight to maintain his position as crime kingpin. He needs something done, something illegal, and his old friend McCoy is the only one who can do it.

As word begins to circulate on the streets that another, bigger explosion is being planned for Glasgow, McCoy battles corruption in his ranks in an attempt to save the city for which he is the perfect noir hero.