This book uses original resources to uncover the valuable help given to Britain’s leaders and her elite by the Scot, John Drummond of Quarrel. It reveals why he proved indispensable as a special consultant and counsellor to statesmen, nobles and businessmen, shows his devotion to the 1707 Union, and how he fed expansion of Britain’s Empire while spying on her enemies. His professionalism, learned from the renascent culture of his beloved Scotland, benefitted commercial society in Britain and Holland. The volume argues that his contribution to a momentous, much discussed era was extraordinary, and his activities boosted exchange of global knowledge, to the particular benefit of Scotland.