Greenmantle is the second of five novels by John Buchan featuring the character of Richard Hannay, first published in 1916 by Hodder & Stoughton, London.John Buchan, 1st Baron Tweedsmuir, GCMG, GCVO, CH, PC was a Scottish novelist, historian, and Unionist politician who served as Governor General of Canada, the 15th since Canadian Confederation.