What were American Special Forces doing in Ireland twenty-five years ago and why does it matter now?

Jack valentine has been in the intelligence game for too long and it is starting to show, but he accepts one more mission. Suddenly he has information that everybody wants and he finds himself the quarry in a pitiless chase - with an old IRA friend, also in danger, and his sister Deirdre, Jack's beautiful ex-girlfriend. Valentine no longer knows which threatens him most - the dark alliance of men who want to kill him, the terrible storm crossing, or his own dangerous cynicism.