Mr Standfast

According to Wikipedia, "Mr Standfast is the third of five Richard Hannay novels by John Buchan, first published in 1919. It is one of two Hannay novels set during the First World War, the other being Greenmantle (1916); Hannay's first and best-known adventure, The Thirty-Nine Steps (1915), is set in the period immediately before the war started. The title refers to a character in John Bunyan's Pi...