He was one of the great men in 18th century Europe. She was one of the celebrated beauties of Georgian Edinburgh, and less than half his age. They fell in love.  Edinburgh was scandalised; London was astonished; Paris was titillated.  The story of the doomed relationship of David Hume and Nancy, daughter of Chief Baron of the Exchequer, Robert Ord, has been largely lost to Scottish history – until now. Kelly Burke, whose previous one woman show Zelda was a 2006 Fringe hit, unlocks the secret.