When Lisa Mann and Ian West undertake the investigation of the 1922 assassination of Irish leader Michael Collins, the search for the assassin takes them from Dublin to Rome and on to Scotland. They find once again that the past can have deadly consequences in the present day, putting their lives and those of their friends in peril as a terrorist group strives to ensure that the name of Collins' killer remains a secret. The intrepid duo continue to unravel the mystery until their quest finally comes to an unexpected and explosive conclusion in the Scottish Highlands.