In 1598 the Catholic Valentine Thomas was apprehended near Morpeth in northern England. Thomas's confession accused King James VI of Scotland of encouraging him to murder Queen Elizabeth I of England. Rumours of Thomas's confession reached Scotland, transforming it into a matter of Anglo-Scottish diplomacy. This article will focus on the English political context as intensive diplomatic exchanges passed between ambassadors and through the royal correspondence in the search for a resolution. The Valentine Thomas affair was a paradox, for while the plot was minor, its connection to the Elizabethan succession debate turned it into a matter of diplomatic importance.