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 – with the threat of more to come. Soon McCoy realises that the sailor may be part of a shadowy organisation committed to a very different kind of Scotland. One they are prepared to kill for. Meanwhile Cooper, McCoy’s long-time criminal friend, is released from jail and convinced he has a traitor in his midst. As allies become enemies, Cooper has to fight for his position and his life.